... high-fidelity, high resolution DIGITAL stereo effect. 3.holder function. 1, high-fidelity, high resolution DIGITAL stereo effect ... RF point 6. cigarette lighter power supply 7, 3.5mm audio input interface for portable CD, MD, ... MP3 power supply or battery charging) 10, transmitter, charger, frame one, use more convenient, more beautiful. 11 ... music and its frequency 7 in 1 Car Kit for IPod-iPhone P37