Check the listing for details. Shelly BLU Door/Window. Condition: New. Listed at 20.95 USD. Shelly BLU Door/Window BT-operated Door Window sensor Shelly BLU Door/Window (the Device) is a Bluetooth sensor designed to detect the opening and closing of a door or a window. It can also measure the angle of a inclination of a door or a window that tilts and turns. In addition, it features a light sensor.KEY FEATURES Long battery life Door/window opening and closing detection Door/window inclination angle measurement Illumination measurement Beacon mode Encrypted mod SPECIFICATIONS Type Value Physical Size (HxWxD): 35x35x7 mm ±0.5 mm / 1.38х1.38х0.27 in ±0.02 in (Sensor unit) 35x12x7 ±0.5 mm / 1.44х0.47х0.27 in ±0.02 in (Magnet) Weight: 10 g ±1 g / 0.35 ±0.05 oz (Device with the battery) 8 g ±1 g / 0.28 ±0.05 oz (Magnet) Shell material: Plastic Color: White, black, brown Environmental Ambient temperature: -20 °C to 40 °C / -5 °F to 105 °F Humidity: 30 % to 70 % RH Electrical Power supply: 1x 3 V CR2032 battery (included) Battery life: 5 years Sensors Reed switch Yes G-sensor Yes Light sensor Yes Radio RF band: 2400 - 2483.5 MHz Max. RF power: