Use advanced infra-red sensor technology, it is different from the voice-actived and touch sensor. It has advantage of high sensitivity, anti-interference, noiseless, fast reaction speed. Small and exquisite appearance, pocket-size, it is convenient to carry. It adopts optical lens to spot light, it can increase brightness. Built-in light sensor, it can identify day, dusk, night by itself. Comes on automatically as you approach. Automatic sensor switch, easy to install, convenient to use. With USB data line, it can charge for the light, you can also use 2 AAA batteries. Suitable for restaurant, hotel, school and other places.