Bullet Point:Intelligent induction, do not work during the day, solar automatic charging, automatic flash at night.Built-in light sensor, this LED light will flash in nighttime and will not flash in daytime. This LED alarm light does NOT require a car alarm system. No wires needed, just stick it to the roof of the vehicle with corresponding glue. Solar energy can be absorbed and saved in high efficiency solar cells. You need not put it under sunshine directly. Sunshine above the dashboard is enough. It can be charged by solar whether you put switch to "on" or "off". Switch is tiny. You need a ballpen or little stick to push it. Specifications:Type : Solar anti-theft warning lightsMaterial: Engineering ABSSize: 50 x 25mmPackage Included:1 x Car Solar Power Simulated AlarmPacking list