Works Great for Me
Using this little bluetooth contact sensor in the mechanical room of my basement, on the lid of my washing machine. It’s part of an automation on Home Assistant that ends a “nag” if I haven’t removed my wet laundry after a cycle. If the lid is open for greater than 20 seconds, the nag turns off. The lid closes, the nag is reset for the next load.This was very easy to install and it’s quite small. In my case, it melds in quite well with my washing machine. Because I have bluetooth proxies everywhere, I have zero connection issues.It was definitely a good value for the money, and enables me to use a non-Zigbee device in a location that sometimes gets Zigbee-cranky.

Great replacement for a door/window ZWave sensor
These work fantastically well as a trigger for doors and windows for automations in Home Assistant. They have tremendous range; one Shelley Gateway located in a central location of my house can detect/monitor these small sensors all over the 5,000 square foot dwelling. They also have an ambient photosensor to tell Home Assistant the light level of the room, as well as a built-in tilt sensor to detect how tilted the unit is. They are also very light weight and tiny, easy to hide, and come in three colors to help it blend in even more.I will dock a star, however, for how difficult they can be to open up, how in roughly half of these that I have bought their batteries arrived dead, and how when you first get them, they “kinda” work until you update their firmware, and the firmware update is quite flaky and requires frequent “wake up” sessions and force quits of the application to get them to work.I’d like to see Shelley expand this as an option to create a whole-home security system alternative to zWave/ZigBee devices by adding a true security hub, or at least a siren/audible alarm to indicate an intruder. Until that day, I can probably do alternative methods, but these sensors are absolutely great once you get a new battery into them.

Instructions suck. But great product
It works great but instructions really suck! I returned one thinking it wasn’t working but it was. Check on YouTube for the video on the Shelly guide. I can’t post the link on the review but it will takes 5 min to set it up. Hope that helps

worked great until it didn’t. Magnet destroyed switch.
This product is unique in that it connects via bluetooth through one of shelly’s other smart devices. That makes it extremely useful in some specific cases. Say, for example, you had a wifi or ethernet connection to a gate on on a long driveway, you could put one of shelly’s wifi devices (such as a mini-relay or smart plug) that supports bluetooth there and this door sensor could be used to monitor the gate (and temeperature and light). Similarly if you only had ethernet there but no wifi you could use one of shelly’s “pro” devices which has a lan connection but provides a bluetooth connection for the door sensor. This would be difficult with zigbee if you didn’t have repeaters in between.I did they and it set it up and it tested beautifully – and I was able to connect it to home assistant without any trouble. So far so good…But I let it come into physical contact with a magnet and now the the reed switch inside is broken and is stuck on the open state. The illuminance and tilt functions still work fine. So I’m a bit bummed out the magnetic reed switch is so fragile – I’ll have to order a new one before I even installed it in its permanent location.update 1 week later: I did a firmware update and it doesn’t seem to wake up to adjust the state unless I press the button now. So maybe it has gotten worse. I have ordered a new one and will change my review if a second try shows improved results.

Ho acquistato questo dispositivo per monitorare l’apertura della porta e migliorare la sicurezza della casa. L’installazione è stata semplice e immediata: tramite l’app Shelly il riconoscimento è rapido e la configurazione richiede pochissimi minuti.Il vero punto di forza è l’integrazione con Home Assistant 🏡. Una volta aggiunto alla rete, il sensore viene rilevato automaticamente e si può subito utilizzare in automazioni, notifiche di sicurezza e scenari personalizzati. La risposta agli eventi è veloce e l’aggiornamento dello stato è sempre preciso.📸 Nota sull’installazione:Il sensore si mimetizza molto bene sulla porta grazie alla finitura effetto legno. Una volta installato, risulta poco invasivo e si integra perfettamente con il telaio, mantenendo un aspetto pulito ed elegante.La qualità costruttiva è solida, il segnale Wi-Fi rimane stabile e il sensore risponde sempre in modo affidabile.✔️ PRO:- Configurazione immediata tramite app Shelly- Integrazione perfetta con Home Assistant- Rilevamento rapido e preciso 🚪- Ottima resa estetica grazie all’effetto legno- Segnale stabile e costruzione robusta❌ CONTRO:- Forse un po’ troppo costoso

Aunque cuesta algo integrarlo si no estas en el mundo de la domótica, luego es útil para saber si tienes ventanas abiertas si llueve, pudiendo hacer que, por ejemplo, se bajen persianas para que no entre el agua si estas fuera de casa o sin pasar por todas las habitaciones. Tiene sensor de luminosidad por lo que también se puede integrar con el encendido de luces.