Feature:1. Door Open Alarm: Able to detect the door open status, the window sensor also enables 5mm offset and nearly 1cm gap, ensuring high safety.2. Extensive Using: Suits perfectly for garage doors, skylights, safes, cabinet, refrigerator doors, drawers, safe box and so on, very useful.3. Simpler Control: In the 2.4G network, just connect your smart door magnetic sensor to the application for convenient control and operation.4. Faster Alarming: When the status of the protected device changes, you will receive timely alert notifications from the smartphone application.5. Easy to Install: 2pcs double sided tape are also included, ensure that the surface is clean and dry and can be pasted on any door or window.Specification:Item Type: Door Window SensorModel: D06Supporting Wireless Network Protocol: WIFI 2.4GHzSupporting Wireless Standard: IEEE 802.11b/g/nOperating Temperature: 0 ~ 40Humidity: 20% - 85% RHPower Supply: 2 x AAA battery, can trigger 6000 times. Delivered without battery. .Package List:1 x Large Sensor1 x Small Sensor1 x User Manual2 x Double Sided Tape4 x Screw4 x Wall Plug