Please read this before you buy 1. This sensor must match the for xiaomi multifunctional gateway or for Aqara gateway hub ( need to be purchased separately ) to use. 2. for Aqara gateway hub is required to make this sensor to work with HomeKit. Highlights ● for Aqara smart door and windows sensor for daily security ● ZigBee wireless connection ● Trigger and alarm: Connected with for Aqara Hub, it will trigger alarm when someone break into. ● Away from home mode: Smart linkage with other smart home devices. If someone broke into, the bell will ring and the IP camera ( not included ) will take video. ● Can work with for Apple Homekit, for Mi Home, for Aqara Home ● Small size, easy to install ● Model: MCCGQ11LM ● Battery: CR1632 (included) ● Wireless Protocol: Zigbee ● Maximum Detection Distance: 22 mm ● Operating Temperature: -10℃~+45℃(14℉~113℉) ● Operating Humidity: 0 - 95%RH, non-condensing ● App: for Apple Home app (iOS 10.3 or later), for Aqara Home app (Android 5.0 or later, iOS 10.3 or later), for Mi Home app Two steps to connect with the APP: 1. Open the APP,choose"Add More" in the main interface, add the window door sensor 2. Press the "Reset" button of the sensor Color: White Material: plastic Package Contents: 4 * Door Window Sensor