DC 12V 2PCS 15 LED Auto Car Sound Effect Control Sound Activated Music Light Cigarette Lighter Powered Lamp Car Charge Voice/Sound Control LED Music Decoration Light. For 12V DC Cars, plug directly into the cigarette lighter. Follow the music beat, adjustable flashing, to fit the strength of the sound. 3 oprating states: ON-Beat-OFF. Light color: colorful Size: 20cm x 1.5cm