The Shelly BLU Door/Window Sensor in black is a compact Bluetooth sensor that reports door and window openings, tilt levels and light levels. It works with the Shelly Smart Control app and home automation systems when paired with a gateway. A CR2032 battery gives up to 5 years of use and reaction times under 100 ms. Alerts and automation can be set up through the app or voice assistants such as Alexa and Google Home. Installation is discreet and suits most door or window frames.\n\nShelly BLU Door/Window Sensor Black Bluetooth Smart Home Security Detector\n\nSeller Info\n\nUK Seller\nUK Stock\nBrand New\n\nFast Dispatch\nUsually within 24 hours\n\n30-Day Returns\nNo hassle refunds\n\nQuick Responses\nUsually within 4 hours\n\nOverview\n\nThe Shelly BLU Door/Window Sensor is a compact Bluetooth device that detects and reports door and window openings, tilt levels and luminosity. It is designed for discreet fitting on door or window frames and works with the Shelly Smart Control app fog