Useful gadget: This window connection sensor can detect the states of a window's close or open, so you won't forget to close the window.Suitable occasions: This close open detector is a good fit for securing a window, door, cabinet, drawer, safety box, and so on and is easy to install.Fits locations: This door connection detector is widely used in an office, garage, warehouse, living room, bedroom, balcony, and so on.App control: This smart window connection sensor can connect to WiFi and allows you to use a phone APP to check the window states.Other functions: You can connect this WiFi door sensor to other smart devices to achieve automatic management, such as opening a light when the door is opened.Specification:Material: ABS.Color: Show as picture.Size(LxWxH): Main: Approx. 82x42x16mm/3.23x1.65x0.63 inch; Secondary: Approx. 82x11x18mm/3.23x0.43x0.71 inch.Battery: 2x AA batteries(Not included).Spare current: 6.5uA.Working temperature: 0-40.Working humidity: 20-85%.Working temperature: 0-40(32-104).Storage temperature: 0-60(32-140).Storage humidity: 0-90%.Trigger current: 43mA.Pair current: 37mA.WiFi frequency: 2.4Ghz.WiFi type: Zigbee 3.0 IEEE 802.15.4.Range: Approx. 55m/180.45ft.Note:There might be a bit of color distortions due to different computer resolutions.There might be a slight error due to different hand measurements.Package Includes:1 Piece Door Sensor(with 1 Piece User Manual).