•Connect the Dual Dock to your computer with the attached cable, then place your iPhone and iPhone Bluetooth Headset in the Dock to sync the iPhone and charge them both. No more reaching behind the computer to plug it in.
•Connect the Dock to the included Apple USB Power Adapter plugged into an electrical outlet, then place your iPhone and iPhone Bluetooth Headset in the Dock to charge both batteries.
•Connect the Dock to a stereo or speakers using an AV Cable or a stereo audio cable to play music from your iPhone.
•Enjoy clear audio during speaker-phone calls thanks to special audio porting. 
•Dimensions:2.6 in x 1.73 in x 0.71 in
•Weight:2.29 oz