Light Sensor T1 Brightness Sensor Smart Lighting Change Controlled Light Sensor connection must works with gateway and some Open source gateway Supports APP when you connect with APP, you need change the region to China Mainland Light Sensor Brightness Sensor Automation Smart home Light Detector by APP Control Product name:Smart Button Working Range:25m Open Area Power input:CR2450 button battery (5 years, 20 times per day) working temperature:-10℃~45℃ Colour: White Material: ABS Package Contents: 1 x switch 1 x double-sided tape 1 x Instructions in Chinese and English 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.