Wireless Bluetooth Headset - Black Adjustable music volume +/- and Next/Previous options. Bluetooth Version: CSRV4.0 + EDR Class 2. Rechargeable Internal Battery 150 mAh Li-Polymer battery. 18 hours Run Time when fully charged - 300 hours Standby when fully charged. Padded/Folding Earcups and Adjustable Head Rails.