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SwitchBot Door Alarm Contact Sensor - Smart Home Security Wireless Window Alarm and Door Sensor, Add SwitchBot Hub to Make it Compatible with Alexa


$24.99 $192.23 per cm
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WORKS WITH ALEXA
Add voice control by combining with an Alexa device & hub
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Purchase options and add-ons

Color white
Brand SwitchBot
Power Source Battery Powered
Compatible Devices Smartphones or tablets with Bluetooth 4.2 or above
Product Dimensions 1"L x 0.47"W x 0.91"H

About this item

  • [Window & Door Alarm Sensor for Home Security] SwitchBot Contact Sensor can detect the opening/closing of doors and windows, guarding security of the elderly, children, and pets. With the built-in light sensor, it will automatically trigger the Switchbot Bot to turn on the light when someone moves when the environment goes dark. The magnets need to be aligned with the bottom of the body, and the distance between the two components needs to be less than 1.2 inches (30mm).
  • [Detects People Leaving or Entering the Home] With the built-in motion sensor, Contact Sensor will know whether you are leaving or coming home, making it possible to trigger the different actions you set in the "Scene" in the SwitchBot app. When it detects you leaving home, the appliances will automatically turn off, and when it detects you coming home, the appliances will automatically turn on. (SwitchBot Hub Mini required)
  • [Easy to Install & Place It Anywhere] Thanks to the small and wireless design with long battery life, you can install Contact Sensor tool-free and get it set up in seconds. Place it on a medicine box to track whether the elderly are taking their medication, or place it on your pet's cage to know if your kitten has slipped away.
  • [Part of the SwitchBot Ecosystem] Connect Contact Sensor with other SwitchBot products and set up a ”Scene“ in the SwitchBot app. When windows are opened, the SwitchBot Bot will be triggered to turn off the Air purifier automatically. (SwitchBot Hub required)
  • [Remote Alert Notification & Voice Alarm from Alexa] You will receive a door-open alert notification on your phone if a suspicious person enters the house while you are away (SwitchBot Hub required). Alexa will start a voice alarm to scare off any burglars, ensuring your apartment security.
See more product details

Customer ratings by feature

Easy to install
4.1 4.1
Motion detection
4.0 4.0

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$24.99 ($192.23/100 cm)
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Product Description

1

SwitchBot is your simple switch to a smart home. With easy setup, we help you to create a comfortable home with innovative smart home products.

SwitchBot Contact Sensor can do more than detecting window/door open and closed, making your home much more smart and safe.

Two components stand in line

Sense door/window open and closed

With a detection range of up to 16.4 ft (5m), 90° horizontally, and 55° vertically, SwitchBot Contact Sensor detects your door/window open and closed. The magnet part of SwitchBot Contact Sensor needs to be aligned with the bottom of its main body, and the distance between the two components should be less than 1.2 inches (30mm).

*The data above is obtained from lab experiments conducted under 77°F (25°C)

PC-2 CS
1
Informed of home situation anywhere 24/7

Push Alerts to Your Phone

Connected to SwitchBot Hub (sold separately), The Contact Sensor pushes notifications to your phone when someone enters your home, when the window is open, or when your pet leaves the cage. It also works as an entry sensor for your safe home. With Contact Sensor on the door or window, your home security is taken care of by this watchful gadget and alerts will reach you in seconds even when you are far away. *Set in the app to stop your phone from ringing all the time you receive a notification.

Compatible with Echo devices

Voice alarm from Alexa

SwitchBot Motion Sensor works perfectly with your smart home appliances as a security partner. Connected to SwitchBot Hub, Alexa will alert you when a burglar is entering your home. If a suspicious person enters the house, Alexa will start an alarming voice to scare off the burglar.

*Alexa and Google Home currently do not support Contact Sensor's light level sensor or motion features. However, this feature is currently supported by IFTTT. Only SwitchBot Hub 2 supports matter.

1

Detect you leaving or entering home

PC-5 CS

A smart way to detect

With a built-in motion sensor, Contact Sensor can tell whether the user is leaving or entering the home when attached to the internal face of the door. Your smart home will conduct all scenes that you pre-set via the SwitchBot app as per both conditions automatically.

*SwitchBot Hub required

PC-5-2 CS

Entering home

When doors are opened and motion is sensed, our device will assume you're leaving and auto-off your appliances when you're away. When nobody is sensed first and a door is opened, we'll know that you're coming back and you turn all appliances on in the same way.

*SwitchBot Hub required

PC-6
Using your imagination

Place it anywhere in your home

Small in size, easy to install, SwitchBot Contact Sensor can be placed on a refrigerator, pet cage, drawer, or a window to detect whether they are opened or closed. Make objects of all hues smarter by attaching a Contact Sensor to them!

Product information

Technical Details

Additional Information

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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SwitchBot Door Alarm Contact Sensor - Smart Home Security Wireless Window Alarm and Door Sensor, Add SwitchBot Hub to Make it Compatible with Alexa


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Customer reviews

4.2 out of 5 stars
4.2 out of 5
1,800 global ratings

Customers say

Customers like how easy it is to set up the door sensor. They say it's simple and easy to program your lights and gadgets within your house to detect when the door is not closed. They also appreciate how great it works and how well it works in the bathroom. However, some customers have reported issues with Alexa connectivity and automations. They mention that the sensor does not connect to Alexa and that it does not communicate with Apple HomeKit.

AI-generated from the text of customer reviews

9 customers mention "Ease of installation"9 positive0 negative

Customers find the installation process of the alarm to be easy. They mention that it's painless to set up in the app, and that it can be quickly recognized and set up. Some say that it is pretty easy to program your lights and gadgets within your house to detect when it is not closed.

"...Using this, it's pretty easy to program your lights/gadgets within your house to detect when you leave/enter your home and automatically greet you..." Read more

"...Othewise, as with other Switchbot products, it was easy to setup and install. Overall I'm pleased and would buy it again." Read more

"...Was painless to set up in the app - and alerts me when it's not closed. Couldn't ask for me!" Read more

"...Easy set up and install...." Read more

9 customers mention "Performance"8 positive1 negative

Customers like the performance of the alarm. For example, they mention it works great, plays nicely, and triggers routines in Alexa. Some say it works well in the bathroom without any random turn offs. They also say it's an excellent device that works perfectly within the Switchbot app.

"...This works perfectly within the switchbot app and was very quickly recognized and set up...." Read more

"...The only product that works well in the bathroom without any random turn offs. Really a great product." Read more

"...And it works great!I didn't need another hub. That's totally optional if you want really easy internet access or additional automations...." Read more

"...Easy set up and install. Works with google home (can ask if the door is shut which is small but more then i could do with Smart things) only issues..." Read more

5 customers mention "Alexa connectivity"0 positive5 negative

Customers are disappointed with the Alexa connectivity of the doorbell. They mention that it does not hook up to Alexa, has very limited integration, and does not communicate with Apple HomeKit for automations. They also say that they cannot set their phone to receive notifications or alerts if someone opens their apartment door.

"...It won’t send notifications without a hub. I have cheap Tuya sensors and they send notifications when triggered...." Read more

"...I could not set my phone to receive notifications or alerts if someone open my apartment door especially when I'm I will be notified. ...." Read more

"Love the connectivity and app functionality but it will not communicate with apple HomeKit for automations...." Read more

"What a pain in the butt this does not hook up to Alexa and if it does, I’ve tried 100 1 million different ways for it took up to Alexa not only does..." Read more

It does more than most others
5 Stars
It does more than most others
I have a bunch of other motion sensors. A bunch of other buttons. And a bunch of other door sensors. And spent far more on flimsier plastic. Until I found this one. Oh boy was I surprised to find a door sensor, motion sensor and button all in one. And it works great!I didn't need another hub. That's totally optional if you want really easy internet access or additional automations. But if you do have the hub, motion or button controlled lights and plugs are neat.For the tinkerers, there are lots of passive BT options out there for support with third party automation software. It has worked really well with Home Assistant for me and I don't plan on buying any door sensors that support anything less than the SwitchBot Contact.
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Top reviews from the United States

Reviewed in the United States on June 28, 2021
Style: Contact SensorVerified Purchase
This is a great little gadget from Switchbot. It is easy to install, and instantly detects a closed or open door. This works perfectly within the switchbot app and was very quickly recognized and set up.

I installed this on my front door at the top, and it was incredibly easy. Just peel off the 3M tape, and stick it. and then it's installed. now i can use the contact sensor within the Alexa app using a routine to tie it into other home automation programs!

Using this, it's pretty easy to program your lights/gadgets within your house to detect when you leave/enter your home and automatically greet you or turn your lights on!

I can't wait to see the next set of Switchbot products!
5 people found this helpful
Report
Reviewed in the United States on July 25, 2023
Style: Contact SensorVerified Purchase
I have this sensor mounted on an exterior door. Usually when the door is opened, I get a notification on my Android phone (Pixel 7) almost immediately (95% of the time). However there are times where notifications can take up to 10 minutes, and I'm not exactly sure why. This could be an issue with my phone and completely unrelated to this device - not sure. Othewise, as with other Switchbot products, it was easy to setup and install. Overall I'm pleased and would buy it again.
Reviewed in the United States on January 21, 2024
Style: Contact SensorVerified Purchase
My SwitchBot experience is fantastic, i am really enjoying all the products i have.

Especially the contact sensor. 3 sensors in one device, ambient light sensor, open/close sensor and motion sensor. This enables a great range for automation. The only product that works well in the bathroom without any random turn offs. Really a great product.
Reviewed in the United States on April 18, 2022
Style: Contact SensorVerified Purchase
I have a bunch of other motion sensors. A bunch of other buttons. And a bunch of other door sensors. And spent far more on flimsier plastic. Until I found this one. Oh boy was I surprised to find a door sensor, motion sensor and button all in one. And it works great!

I didn't need another hub. That's totally optional if you want really easy internet access or additional automations. But if you do have the hub, motion or button controlled lights and plugs are neat.

For the tinkerers, there are lots of passive BT options out there for support with third party automation software. It has worked really well with Home Assistant for me and I don't plan on buying any door sensors that support anything less than the SwitchBot Contact.
Customer image
5.0 out of 5 stars It does more than most others
Reviewed in the United States on April 18, 2022
I have a bunch of other motion sensors. A bunch of other buttons. And a bunch of other door sensors. And spent far more on flimsier plastic. Until I found this one. Oh boy was I surprised to find a door sensor, motion sensor and button all in one. And it works great!

I didn't need another hub. That's totally optional if you want really easy internet access or additional automations. But if you do have the hub, motion or button controlled lights and plugs are neat.

For the tinkerers, there are lots of passive BT options out there for support with third party automation software. It has worked really well with Home Assistant for me and I don't plan on buying any door sensors that support anything less than the SwitchBot Contact.
Images in this review
Customer image
Customer image
4 people found this helpful
Report
Reviewed in the United States on June 25, 2024
Style: Contact SensorVerified Purchase
I have temperature and humidity sensors from SwitchBot and they work very well and I like them. I bought this sensor expecting the same working function with one notable flaw. It won’t send notifications without a hub. I have cheap Tuya sensors and they send notifications when triggered. I am disappointed with the SwitchBot because it doesn’t. Having dealt with security cameras that had a hub I said never again. A hub is just another level of aggravation to use the device. Totally unnecessary in my opinion.
Reviewed in the United States on May 2, 2023
Style: Contact SensorVerified Purchase
Love it. I installed it on my garage door so that I can get notified in case we brain fart and forget to shut the garage. So far, so good. I'm a little worried about the double sided 3M tape just because my wall is a little textured, but after a few days, it's still up there. Was painless to set up in the app - and alerts me when it's not closed. Couldn't ask for me!
Reviewed in the United States on January 18, 2024
Style: Contact SensorVerified Purchase
Disappointed, angry, and frustrated about this purchase and the app. The toll free hot line is disconnected. Company should be ashamed of themselves. I received better technical devices on Temu for a forth of the price compared to the this brand. You can only use about 15% when you download the app for this device for the setting. If you don't have the Switchbot Hub the remaining 85% is a complete waste of space.

I could not set my phone to receive notifications or alerts if someone open my apartment door especially when I'm I will be notified. . And I'm still wondering what the Fresnel lens because the manual does not explain it they give you another QR code for more information.

However, it does tell you how to connect with Amazon Alexa device but the device is practically useless and could have brought a indoor camera for for a few extra bucks more for what I paid for. Don't Used this for Security It's Completely Unsafe!!!
One person found this helpful
Report
Reviewed in the United States on July 5, 2021
Style: Contact SensorVerified Purchase
Love the connectivity and app functionality but it will not communicate with apple HomeKit for automations. You can control device from google home though
2 people found this helpful
Report

Top reviews from other countries

Jean
5.0 out of 5 stars Fonctionnel
Reviewed in Canada on May 17, 2023
Style: Contact SensorVerified Purchase
Facile d'utilisation avec l'application Switchbot.
One person found this helpful
Report
Rollinger Luc
5.0 out of 5 stars Excellent produit
Reviewed in France on June 3, 2024
Style: Contact SensorVerified Purchase
Très bon produit.
Il m'a permis de résoudre un problème sur l'activation/désactivation de mon humidification (de la même marque) pour qu'il ne se déclenche plus lorsque la fenêtre est ouverte et de ne plus gaspiller de l'eau inutilement. Ou à l'inverse, de le déclencher quand la fenêtre est fermé et que le taux d'humidité dans la chambre est trop basse.
Waldemar
5.0 out of 5 stars robustes, zuverlässiges Produkt, einfache Montage, gute Automatisierungsmöglichkeit
Reviewed in Germany on February 1, 2024
Style: Contact SensorVerified Purchase
Das Produkt ist ausgesprochen robust: Bei der Montage ist mir der Sensor zweimal aus zwei Meter Höhe auf den Betonboden geknallt - kein Problem, der Sensor funktioniert weiterhin zuverlässig. Die App ist durchdacht, erlaubt eine einfach Integration/Inbetriebnahme und über die Option "Automatisierung" auf das offenstehende Garagentor nach definierten 5 Minuten zu reagieren (und einen SwitchBot Bot zu schalten). Dabei kann die Triggerzeit konfiguriert werden. Eine Integration in Alexa ist problemlos möglich. Da ich Klebebefestigungen prinzipiell misstraue, erfolgte die Montage mittels Kabelbinder. Ein installierter SwitchBot Hub Mini wird benötigt und muss in der Nähe installiert sein. Mein erster Versuch den Hub im Metallsicherungskasten + 3 Wände mit dem Sensor zu verbinden, ist gescheitert, eine Verbindung durch zwei Wände funktioniert hingegen zuverlässig.
JUAN
5.0 out of 5 stars Tres en uno.
Reviewed in Spain on January 3, 2024
Style: Contact SensorVerified Purchase
Encantado. Funciona de maravilla. Tuve de otras marcas, pero daban fallos y no me acababan de convencer. Además es tres en uno. Tiene sensor de movimiento, de luminosidad y un botón, para programar acciones.
F.V.
5.0 out of 5 stars Device 3 in 1: Contact sensor, light sensor, motion detection sensor!
Reviewed in Italy on October 1, 2023
Style: Contact SensorVerified Purchase
[ CONFEZIONE ] : 5/5

Come sempre Switchbot propone una confezione ben fatta, minimale, che si adatta perfettamente alla dimensioni del device.
Tutto il necessario è ben disposto nella scatola in maniera ordinata e facilmente raggiungibile. Oltre al device (composto dal corpo principale e la parte calamitata), troviamo un piccolo ma ben scritto manuale di istruzioni, 2 batteria AAA (il fatto che le includano sempre è significativo della attenzione al cliente), un pacchettino viti laddove non si volesse utilizzare l'adesivo preapplicato, una coppia di adesivi laddove si volessero sostituire (immaginate di montare il sensore su una finestra e poi volergli cambiare posizione, switchbot vi consente di farlo a costo zero dato che include il secondo adesivo).
Insomma, come sempre ottimo packaging in uno spazo ridottissimo.

[ ESTETICA E QUALITA’ COSTRUTTIVA ] : 5/5

Switchbot mi ha abituato a prodotti molto curati per qualità costruttiva ed estetica. Per la verità stavolta il prodotto è talmente piccolo che è anche difficile andare nei dettagli, ma ci sono alcuni particolari che fanno la differenza: la plastica bianca utilizzata si adatta perfettamente agli appartamenti moderni (nel mio caso ho sia le finestre che la porta di ingresso bianche come molti degli appartamenti moderni, quindi il sensore si mimetizza con gli stessi); la qualità costruttiva è super come sempre, seppur il corpo principale debba ospitare delle pile AAA intercambiabili, pertanto deve poter essere aperto una volta montato, non genera alcuno scricchiolio e la sostituzione pile è rapida ed agevole; la potenza dell'adesivo è incredibile, non si staccherà mai involontariamente dalla superficie su cui lo monterete, assicurato!; infine, ho trovato superbo il fatto che nello stesso dispositivo, ingegnerizzando bene tutto, siano riusciti a mettere un sensore di contatto, un sensore di luminosità ed un motion detection sensor con una distanza frontale di 5 metri e laterale di 2 metri per ogni lato. Incredibile tutto questo in un oggetto così piccolo, complimenti!

[ FUNZIONAMENTO ] : 5/5

Semplicissimo! è un dispositivo praticamente plug & play: lo togli dalla confezione, monti le pile, lo attacchi alla finestra/porta da controllare (io l'ho fatto usando gli adesivi ma se volete potete usare anche le vitine incluse) ed il gioco è fatto.
Mi raccomando solo a 2 cose: il magnete deve essere allineato ala parte bassa del corpo principale e la distanza tra magnete e corpo principale deve essere di massimo 3cm. Dopo il montaggio dovrete solo configurare il device tramite app: solita configurazione in bluetooth cliccando dall'app il tastino "+" e decidendo il nome da dare al sensore. Una volta configurato potrete utilizzare le funzioni (aperto, chiuso, lasciato aperto...) sia da app switchbot che tramite comandi vocali alexa (se avete un hub). L'unica cosa da segnalare è che attualmente alexa riconosce solo "aperto" e "chiusto" ma non il "lasciato aperto", tuttavia ho segnalato la cosa a switchbot e come sempre (sfido a trovare una azienda piu disponibile e solerte nelle risposte) mi hanno detto che forniranno un update del firmware per rendere possibile la cosa anche esternamente all'app, quindi con alexa.
Il funzionamento, testato per circa una settimana, è perfetto: usato sia su una finestra che sul mio frigorifero e non ha perco un colpo. Ben funzionante anche il sensore di luminsità: capisce perfettamente se la stanza è ben illuminata o meno e lo fa anche con una certa rapidità che non ti aspetti da un device così piccolo ed economico.
Bravi gli ingegneri di switchbot!

[ INNOVAZIONE ] : 5/5

I sensori di contatto esistono da tantissimi anni, pertanto penserete "cosa ci potrà mai essere di così innovativo?" ed allora ve lo elenco:
1: è tutto completamente senza fili, installabile ovunque, con una portata importante e senza alcun problema di rilevamento
2: è gestibile sia da app switchbot che da assistenti vocali come alexa, se lo collegate ad un hub (consiglio l'hub 2 matter sempre di switcbot)
3: non è solo un sensore di contatto ma anche un motion detector ed un light sensor. Ben funzionante!
4: i sensori di contatto tipicamente hanno un allarme intergrato oppure sono collegati ad un allarme casalingo che gerena rumore assordante. Con questo piccolo device invece potrete decidere voi come farvi avvisare: tramite notifica senza suono, con suono su cel, con allarme e messaggio vocale customizzato da alexa (ad esempio io ho personalizzato i messaggi "frigorifero aperto" e "finestra aperta" e valgono molto più di un allarme che non ti indica subito che tipo di intrusione si sta subendo) ed in altri modi che solo la fantasia vi potrà limitare ( proprio ora me ne è venuto in mente uno: farò accendere di rosso uno dei miei led quando il frigo risulterà aperto, geniale no?!? :) )
In definitiva, piccolo device, piccolissimo prezzo, grande innovazione. Brava Switchbot!
Customer image
F.V.
5.0 out of 5 stars Device 3 in 1: Contact sensor, light sensor, motion detection sensor!
Reviewed in Italy on October 1, 2023
[ CONFEZIONE ] : 5/5

Come sempre Switchbot propone una confezione ben fatta, minimale, che si adatta perfettamente alla dimensioni del device.
Tutto il necessario è ben disposto nella scatola in maniera ordinata e facilmente raggiungibile. Oltre al device (composto dal corpo principale e la parte calamitata), troviamo un piccolo ma ben scritto manuale di istruzioni, 2 batteria AAA (il fatto che le includano sempre è significativo della attenzione al cliente), un pacchettino viti laddove non si volesse utilizzare l'adesivo preapplicato, una coppia di adesivi laddove si volessero sostituire (immaginate di montare il sensore su una finestra e poi volergli cambiare posizione, switchbot vi consente di farlo a costo zero dato che include il secondo adesivo).
Insomma, come sempre ottimo packaging in uno spazo ridottissimo.

[ ESTETICA E QUALITA’ COSTRUTTIVA ] : 5/5

Switchbot mi ha abituato a prodotti molto curati per qualità costruttiva ed estetica. Per la verità stavolta il prodotto è talmente piccolo che è anche difficile andare nei dettagli, ma ci sono alcuni particolari che fanno la differenza: la plastica bianca utilizzata si adatta perfettamente agli appartamenti moderni (nel mio caso ho sia le finestre che la porta di ingresso bianche come molti degli appartamenti moderni, quindi il sensore si mimetizza con gli stessi); la qualità costruttiva è super come sempre, seppur il corpo principale debba ospitare delle pile AAA intercambiabili, pertanto deve poter essere aperto una volta montato, non genera alcuno scricchiolio e la sostituzione pile è rapida ed agevole; la potenza dell'adesivo è incredibile, non si staccherà mai involontariamente dalla superficie su cui lo monterete, assicurato!; infine, ho trovato superbo il fatto che nello stesso dispositivo, ingegnerizzando bene tutto, siano riusciti a mettere un sensore di contatto, un sensore di luminosità ed un motion detection sensor con una distanza frontale di 5 metri e laterale di 2 metri per ogni lato. Incredibile tutto questo in un oggetto così piccolo, complimenti!

[ FUNZIONAMENTO ] : 5/5

Semplicissimo! è un dispositivo praticamente plug & play: lo togli dalla confezione, monti le pile, lo attacchi alla finestra/porta da controllare (io l'ho fatto usando gli adesivi ma se volete potete usare anche le vitine incluse) ed il gioco è fatto.
Mi raccomando solo a 2 cose: il magnete deve essere allineato ala parte bassa del corpo principale e la distanza tra magnete e corpo principale deve essere di massimo 3cm. Dopo il montaggio dovrete solo configurare il device tramite app: solita configurazione in bluetooth cliccando dall'app il tastino "+" e decidendo il nome da dare al sensore. Una volta configurato potrete utilizzare le funzioni (aperto, chiuso, lasciato aperto...) sia da app switchbot che tramite comandi vocali alexa (se avete un hub). L'unica cosa da segnalare è che attualmente alexa riconosce solo "aperto" e "chiusto" ma non il "lasciato aperto", tuttavia ho segnalato la cosa a switchbot e come sempre (sfido a trovare una azienda piu disponibile e solerte nelle risposte) mi hanno detto che forniranno un update del firmware per rendere possibile la cosa anche esternamente all'app, quindi con alexa.
Il funzionamento, testato per circa una settimana, è perfetto: usato sia su una finestra che sul mio frigorifero e non ha perco un colpo. Ben funzionante anche il sensore di luminsità: capisce perfettamente se la stanza è ben illuminata o meno e lo fa anche con una certa rapidità che non ti aspetti da un device così piccolo ed economico.
Bravi gli ingegneri di switchbot!

[ INNOVAZIONE ] : 5/5

I sensori di contatto esistono da tantissimi anni, pertanto penserete "cosa ci potrà mai essere di così innovativo?" ed allora ve lo elenco:
1: è tutto completamente senza fili, installabile ovunque, con una portata importante e senza alcun problema di rilevamento
2: è gestibile sia da app switchbot che da assistenti vocali come alexa, se lo collegate ad un hub (consiglio l'hub 2 matter sempre di switcbot)
3: non è solo un sensore di contatto ma anche un motion detector ed un light sensor. Ben funzionante!
4: i sensori di contatto tipicamente hanno un allarme intergrato oppure sono collegati ad un allarme casalingo che gerena rumore assordante. Con questo piccolo device invece potrete decidere voi come farvi avvisare: tramite notifica senza suono, con suono su cel, con allarme e messaggio vocale customizzato da alexa (ad esempio io ho personalizzato i messaggi "frigorifero aperto" e "finestra aperta" e valgono molto più di un allarme che non ti indica subito che tipo di intrusione si sta subendo) ed in altri modi che solo la fantasia vi potrà limitare ( proprio ora me ne è venuto in mente uno: farò accendere di rosso uno dei miei led quando il frigo risulterà aperto, geniale no?!? :) )
In definitiva, piccolo device, piccolissimo prezzo, grande innovazione. Brava Switchbot!
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