This amazing sound activated is a layer of soft and thin sheet be stocked on rear windshield side window, or wherever you feel appropriate. It is furnished with double faced adhesive tape and 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 demand to equip a lighter for cigarette instead, the lighter can be directly inserted into car to make lamp lightening. Easy Installation 1. Stick the sticker on rear windshield or side window inside the car via double faced adhesive tape. 2. Connect the adapter to the sticker gently using a 3m converter cable 3. Plug the cigarette lighter into car 4. Start the music Size: 90cm x 25cm Inverter cable Length: About 3m Cigarette cable Length: 1.2m LED light color: Colorful Voltage: DC 12V