Please read this before you buy 1. This sensor must match the for multifunctional gateway or for gateway hub ( need to be purchased separately ) to use. 2. for gateway hub is required to make this sensor to work with . ● for smart door and sensor for daily security ● ZigBee wireless connection ● Trigger and alarm: Connected with for Hub, it trigger alarm when someone break into. ● Away from home mode: Smart linkage with other smart home devices. If someone broke into, ring and the IP camera ( not included ) take video. ● Can work with for , for Mi Home, for 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 (iOS 10.3 or later), for (Android 5.0 or later, iOS 10.3 or later), for Mi Two steps to connect with the APP: 1. Open the APP,choose"Add More" in the main interface, add the window door sensor 2. the "Reset" button of the sensor Color: White Material: plastic Package Contents: 4 * Door Window Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.