Solar PoweredNo need to install batteries. The car alarm led light is powered by solar energy, solar energy can be absbed sted 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 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, better protect the money in the car. It flashes every 5 seconds.Built-in Light SensThe 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 f cars, motcycles, caravans, boats, trucks, houses greenhouses. It can also be used f fenced yards.SpecificationMaterial: ABSSize: 5cm2cm1.3cmLight Col: blue or redElectricity: solar, usb chargingL ED: Highlight SMD LEDEffect: The simulated car anti-theft lamp flashes every 5 secondsWeight: 20gPackage included:1 solar power simulated warning lightNotes:1. Due to different display lighting effects, the actual col of the item may be slightly different from the col shown on the picture. Thank you2. Due to manual measurement, please allow a measurement deviation of 1-3cm"All Products From Us Have Undergone Strict Quality Checks. if There Is Any Quality Problem You Are Not Satisfied With The Product contact Us. we Will Give You The Best Solution."