RETAILS FOR $39.99 This FM transmitter & charger with USB port plugs into the 3.5mm jack of your iPhone, Smartphone or other mobile devices to provide a clear and crisp audio signal through your car stereo. Use the included aux cable to plug the TuneShift into the headphone jack of your device. The unit also provides a USB port for continuous charging. • Included 3.5mm Cable • 5 Watt USB Charge Port • 100 Digital Channels