HTC Mini USB Audio Headset and Power Charger Port Splitter Y Adapter Cable.
A handy gadget from the good people at HTC. The 2 in 1 Audio Charging USB cable is a dual function adapter that allows you to sync, charge and listen to music. This is an OEM factory original part from HTC. You can connect a phone's headset to it while charging your device up with a mini-USB charger at the same time.