Solar PoweredNo need to install batteries. The car alarm led light is powered by solar energy, and solar energy can be absorbed and stored by high-efficiency solar cells. You don't have to put it directly in the sun. There is plenty of sunlight above the panel. When there is enough sunlight during the day, it may flicker all night. It can also be charged via USB. Easy to InstallNo wires needed, just stick the solar security warning dummy system to the roof with matching glue, which is easy to install and looks clean on the dash. Car Alarm SystemNo need to install a real alarm, using this anti-theft flash blinking lamp can effectively avoid car theft brreaking glass, and better protect the money in the car. It flashes every 5 seconds. Built-in Light SensorThe flashing security lamp will flicker at night, but will not flicker during the day. If you want it to flash during the day, you can cover the other end with black paper. Wide ApplicationThe warning anti-theft system is suitable for cars, motorcycles, caravans, boats, trucks, houses and greenhouses. It can also be used for fenced yards.