LEDHOLYT 5w 18LEDs Warning Caution Emergency Light Bar Strobe Work Flashing Car Glass Sucker Amber(Yellow) Light Color DC 12V 3 modes of flashing light,it will flash automatically after connecting to the power.DC 12v. 18pcs LEDs,high bright,up to 50000 hrs life expectancy.1 year warranty.Mini size,dimension:(L)4.3x(W)3.5x(H)2in. Just put the cigarette connector into the car cigarette lighter,push the switch button to start to work. Easy to install,just put it on the car,there are 3 strong suckers at the base so it can stick to the car roof tightly. Suitble for cars with a 12V DC cigarette lighter adaptor.1 year warranty.