G-Cord Over-The-Head Wireless Bluetooth V4.1 Hands Free Headsets with Microphone for Drivers, Telephone Operators and More Premium materials make them lightweight and comfortable for all-day listening Clear, natural sound at both ends of a call, even in windy or noisy environments Up to 15 hours play time with rechargeable lithium-ion battery The over-the-head configuration can be adjusted to your inclination, just by pulling the metal piece to your fancied length. The Mic also can be rotated to your favorite position Backed by G-Cord One Year limited warranty