Specifications: Remote on/off: turn lights on/off from anywhere. APP support: free mobile APP for tuyasmsart or smart life APP. RF remote control: turn on/off by 433MHz RF remote indoors. Independent control: control each gang separately. Fits old box: seamlessly replaces your old 86 type wall light switch. Sync status: real-time device status provided to APP. Timing: set scheduled/countdown timers to turn on/off at specified time. Share control: control your smart home together with your family. Scene: turn on/off a gang of devices with one tap. Smart scene: triggered on/off by temperature, humidity or other environmental condition. Type: WiFi Smoke Detector Material: ABS + Electronic Component Power Supply: 2 x Battery (Included) Working Current: 110mA Max Sound: 90dB-1m Wireless Type: 2.4GHz Wireless Range: 45m Features: High Sensitive, Smart, Wireless, Home Security Height: 3cm/1.18" (Approx.) Diameter: 7cm/2.76" (Approx.) Note: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x WiFi Smoke Detector