Iphone 30 pin adapter to USB (for charging) and 3.5mm audio out
Charge iPhone In car and play muic out to car Stereo at the same time
One end has a 30-pin connector that attaches to the bottom of your iPad, iPhone, or iPod,
Plug the audio into a home, portable, or car stereo to listen to high quality, line-out audio.
Listening for hours while Plug the USB into a computer or wall charger to charge the iPad, iPhone, or iPod
The end other splits into a 1/8" (3.5mm) stereo audio plug and a standard USB connector