Note: The USB data cable must be plugged in before it can be used. No built-in battery. Features: 1. Wifi+Bluetooth dual mode: connect to the network faster. The connection network speed is 2 times faster than only Wifi 2. Easy to install, just stick it on the wall and use it 3. The brightness sensor is linked with on-off devices, switches, bulbs, sockets, motors, etc. to realize smart home 4. USB powered, don’t worry about the battery running out of power Specification: 1. Color classification: white light sensor 2. Standby power: <= 0.5W 3. Illumination range: 0-1000LUX 4. Working temperature: 0~50℃ 5. Viewing angle: 180° 6. Working humidity: 20%~85% 7. Storage temperature: 0°C~60°C (32°F~140°F)