GTMax Over the Ear Stereo 3D Surround Bluetooth Headset with microphone - Black Ultra slim and trendy design. Unsurpassed stereo music with 3D Surround Bluetooth specification 2.1(class 2)+EDR. Support Profiles: A2DP / AVRCP / HFP V1.5 / HSP Talk Time: Up to 8 hours, Standby Time: Up to 200 hours, Operating Range: 33 Feet, Battery: Built-in Rechargeable Li-Polymer Battery. Stable streaning on bluetooth wireless technology, Built-in Mic supports smart phones, VoIP connection Offer 3 listening mode: 1. Stereo 2. 3D surround 3. Super Surround for theater, gaming experience