Charge iPhone In car and play muic out to car Stereo at the same time. The dock connector sends line level audio out from your cellphone provides a better sound quality than the headphone jack output. Plug the audio into a home portable or car stereo to listen to high quality line-out audio.
Compatible For: iPhone 3G/3GS/4G/4S iPod iPad/iPad 2/iPad 3. Listening for hours while Plug the USB into a computer or wall charger to charge the iPad iPhone or iPod.