Overview: This item is a door and window alarm sensor. The door alarms can work with RF 433MHz Gateway Host to detect the door's opening status and immediately send alarm notification message to the APP. Features: *Simply attach one piece to your door, window or cabinet door, and attach the other piece to the door or window frame. *Ideal intrusion warning for homes, apartments, dorms, offices, hotel rooms, garages, shop counter, Internet bar, etc. *Excellent design, tiny and fashion. Easily install with adhesive tape. *Low-consumption design, more power-saving. *100m wireless transmit distance. Specifications: Support Battery: 1*12V 23A (Included) Wireless frequency: 433.92MHz Protocol: EV1527 Transmit distance: 100m (open) Quiescent current: 3A Emission current: 15mA Trigger alarm distance: 20mm Operating environment: -10-50 (14-122) Size: Main body (D*W*H): 67*26*15mm Deputy body (D*W*H): 53*12*14mm Item Weight: 32g / 1.1oz Package Size: Approx. 7*3*2cm / 2.8*1.2*0.8in Package Weight: Approx. 37g / 1.3oz Packing List: 1 * Wireless Door / Window Sensor 1 * Set of Mounting Stickers