Preview: This item is a door and window alarm sensor. Door alarms can work with RF 433MHz host gateway to detect door open status and send alarm notification message to APP immediately. Features: * Attach one piece to your door, window or cabinet door and attach the other piece to the door or window frame. * Ideal intruder warning for homes, apartments, dorms, offices, hotel rooms, garages, store counter, internet bar, etc. * Excellent design, small and fashion. install easily with adhesive tape. * Low consumption design, more energy saving. * 100m wireless transmission distance. Features : Battery Support: 1 * 12V 23A (included) Wireless Frequency: 433.92 Protocol: Transmission Distance EV1527: 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 Mounting Stickers