Audiovox XMCK-10A XM Xpress Satellite Radio Car Kit Provides you with everything you need to bring the power of XM satellite radio to your car Features an internal wireless FM transmitter, which allows you to play XM satellite radio through any audio device Kit includes a swivel bracket to mount your docking station, a cigarette lighter 12-volt to 5-volt DC power adapter Comes with the smallest available, magnetic roof-mount antennar Runs on 5 volts, 2 amps of DC power, measures 4.44 x 2.44 x 1.22 inches