Wi-Fi smoke and temperature sensor. Built-in siren 120db. No hub required. The sensor operates autonomously for 5 years from a CR123A battery. Ready to work out of the box: the battery is already installed, so the sensor does not need to be disassembled. Connects to the application in one click. Mounted in a few minutes. Android / iOS app - Smart Life. Work as part of a smart home: Alexa Echo, Google Home, IFTT, Tuya. Work without 220V and wires.