The Audio Technica ATH-CK200BT are the ultimate on-the-go headphones. With its 9mm drivers for clear and crisp sound, they offer supreme quality at a great price. With 7 hour of playback and 200 hours of standby on a single charge, they can get you through the day without the need to recharge. They feature an in-line mic and controls, allowing you to easily answer calls, adjust the volume, and control music playback. The headphones can be attached to your shirt using the included clip.