Logitech - Wireless Headset H600 Over-The-Head Design Tiny nano receiver stays in your computer so your headset is always ready to use Laser-tuned speaker drivers and noise-cancelling microphone for clear calls Listen and chat up to 33' from users computer-and longer with a 6-hour rechargeable battery Adjustable headband and foam ear cups feel good even after long hours of use Works with Windows, Mac and common calling applications like Skype, Yahoo! Messenger, Gmail, Windows Live Messenger and AIM