So you would like to turn your existing headphones wireless? Jack by Podo Labs has you covered. It is a Bluetooth audio adapter that turns your headphones wireless. More importantly, it lets you share your music with others. Its 300 mAh battery lasts you up to 12 hours.
Jack is pretty easy to use. Simply plug in your existing headphones, pair the device, and you are set. You can sync two Jacks with the push of a button. Yet another interesting Kickstarter project. Expected to ship in June.