SwitchBot Contact Sensors is made up of two components that are fixed close to each other on things such as doors and windows. With a detection range of up to 16.4 ft (5m), 90° horizontally, and 55° vertically, any movements that your door or window makes can be detected to help notify you when contact takes place. Just simply align the magnet area with the bottom of SwitchBot Contact Sensor’s main body, and you’re good to go. Read more about the product here. Tech Specs Size: Contact Sensor：70.5×25.5×23mm(2.8×1.0×0.9 in.) Magnet：35×12×12.5mm(1.4×0.5×0.5 in.) Weight: Contact Sensor with batteries：49g(1.7 oz.) Magnet：13g(0.5 oz.) Compatibility: Android 5.0+, iOS 11.0+ BLE: ≥5.0 (Long Range) Third-party Service: Alexa,google,IFTTT,Smartthings,Clova，Siri Battery Type: AAA / Alkaline battery×2 SHIP OUT TIME: FAST
