Upgrade your Giro Helmet with stereo sound and a cell phone link so you can listen to your tunes and tap into your phone. The TuneUps II System's exclusive LINK technology from Skullcandy uses a Y cord to plug into your cell and audio device at the same time. An in line volume control and a built in, hands free microphone lets you quickly switch from listening to talking. Giro also included adapters that work with most phones and a travel case that holds 10 CDs or your MP3 player