The Digital Wireless Radio Transmitter wirelessly transmits music from your iPod Nano 5th or iPhone 3G 3G S Generation or MP3 player to your car stereo. The digital tuner locks digitally into the clearest available radio station. Wide choice of channels allows you to tune your car stereo to the clearest FM frequency, and enjoy your music with full stereo sound and convenience. ....The adjustable arm allows you to keep the unit away from the gear. Allows a clutter-free arrangement.