Communication method:Bluetooth-compatible Model Number:RTCG02LM Origin:Mainland China Certification:NONE Note for Xiaomi sensor: 1. !!!This Body Sensor can't work without a xiaomi gateway or any other bluetooth gateway that can works at mi home app, if you don't have a bluetooth gateway, can buy Xiaomi Multifunctional Gateway 2 in our store. 2. This is Chinese version, Before add it to Mihome app, region on mi home app must set to China, set the preferred language at the same time. 3. This product don't supports Zigbee connection Mijia Human Sensor 2 Give information to smart device when light or dark change