Premium materials make them lightweight and comfortable for all-day listening</br>Clear, natural sound at both ends of a call, even in windy or noisy environments</br>Up to 15 hours play time with rechargeable lithium-ion battery</br>The over-the-head configuration can be adjusted to your inclination, just by pulling the metal piece to your fancied length</br>Backed by G-Cord one year limited warranty</br></br>Product Description</br></br>Clearer calls :  These versatile headphones are designed to optimize your phone calls. An advanced microphone system with HD voice and adaptive audio adjustment provides clear calls even in windy or noisy environments. And enhanced side tone makes your voice sound more natural, as if you weren't wearing headphones.   Comfort and durability :  The headphones are engineered for your busy life with premium materials. With soft ear cushion and a adjustable headband, they're lighter and more comfortable than other comparable wireless headphones, so you can enjoy them all day long.   Specially designed for calling :  The Bluetooth headset is designed for comfortable calling, but also can be used to listen to music.   Ultra-long playing time: Standby time: Up to 220 hours, talking time: Up to 15 hours.   What's in box?  1 x Bluetooth V4.1 headset .  1 x user manual .  1 x USB charging cable.</br><br/>http://www.amazon.com/gp/product/B01HGQNDFE