SwitchBot Contact Sensor - Window & Door Alarm Sensor

Made up of 2 components that are fixed close to each other on things such as doors and windows.
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 Sensor’s main body, and you’re good to go
Supports Alexa, Google Home, Siri Shortcuts, SmartThings, IFTTT, and Clova.
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 (Not Included )