Shelly Blu Door/Window White - Smart Bluetooth Montion Sensor Alarm, Home Security, Remote Control Detector, App Alerts, Alexa & Google Home, Gateway Required, Scene Activation, Lux Sensor

Low profile and work well

The button to switch it on did not work. I had to return it to the store.

Excellent sensors. Very long battery life using BLE technology. Used one of these sensors to replace a rechargeable Z-Wave sensor that had to be recharged every four months, necessitating reaching it via stepladders, a real pain.The new Shelly sensor has been operating for over three months now and remaining (cheap) battery life is still 95%Fast response for a sensor at this price point.Usual high Shelly quality.Works with the Shelly app or with Home Assistant using a Bluetooth proxy such as the one built in to many Shelly devices.

The Bluetooth devices aren't the easiest to get setup but once you do they work really well.Works really well with Home Assistant and its Bluetooth relays

I have 8 of these and some of them came with flat batteries. They have no lights or UI so if I had not already known that my setup process to HomeAssistant had worked before then I would have assumed that they were DOA.I had spare CR2032 so could quickly swap the battery to figure which ones were flat but this was not a good experience. They have a proximity, tilt and luminance in a tiny inconspicuous package and would get 5* if not for the lack of a plastic pull tag to ensure the battery did not go bad in the supply chain.

Arrived with an empty battery and an instruction manual for a totally different product.