1、Wireless Connection: Door sensor alarm adopt IEEE 802.11b/g/n protocol, and 2.4GHz wireless type, which is convenient for you to use. 2、Send Notification: WiFi magnetic sensor detects the status of doors and window, and send a notification to your phone when detect abnormal state. 3、Long Standby Time: Wireless door magnetic sensor built in 850mAh CR‑3V lithium battery, provide long working time up yo 5 years. 4、Stable Transmission: WiFi Door magnetic sensor with far transmission distance, up to 45 meters, provide strong signal and simple operation. 5、Widely Use: Wireless door magnetic sensor can be used for doors, window, cabinets, drawers or wherever you want, wide range of applications. Item Type: Door Window Sensor Set Material: ABS Color: White Battery Type: 850mAh CR2-3V Lithium Battery (Included) Internet Protocol: IEEE802.11b/g/n Wireless Control Distance: Approx. 45m / 147.64ft Wireless Type: 2.4Ghz 1 x Sensor Kit (2pcs) 2 x Stickers 4 x Screw 4 x Screw Cover 1 x Description