Simple to use. Low power consumption: only 1mW per spare centimeters. Along with the voice changes,these colorful sticker LED lights are great decoration to any cars. Specification: Size:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 70x16cm,80x19cm, thickness is only 0.35mm,very space saving Life span:Â Â Â Â Â Â Â continuously work for more than 4000 hours Power by :Â Â Â Â Â Â Â DC 12V Weight/pc: Â Â Â Â 200g Using Method: This product is furnished with double faced adhesive tape and it is covered with a protective membrane, you can remove membrane and stick to back windshield. Moreover, if there is a trouble for you to connect the wires in the car, you can equip a lighter for cigarette instead, which can be directly inserted into car to make the lamp lightening. Notice:Â Â Â Â Â Â Â Â Â Â Â Â Red cord to anode(+) and black to cathode(-) Package included: 1 x Car Sticker LED Light 1 x Cigarette lighter and cable 1 x Inverter