Features:1.  Bluetooth stereo headset let's you listen to music or phone calls wirelessly.   2·  Accept incoming calls or toggle between tracks with the touch of a button.   3·  Lightweight,comfortable design for all-day listening.  4·  Compatible with bluetooth enabled devices,such as iPhone,iPad,most computers,cellphones.     5·  Speaker Impedance:32 ohm.    6·  Built-in Microphone, answer to the phone calls when paired with mobilephone.  7·  Built-in rechargeable Li-on battery, charge directly from USB port. 8·  Omni-directional high quality microphone.     9·  Sensitivity microphone.     10·  Transfer Distance:33 FT/10M(No Walls Between the cellphone and this Bluetooth headset,otherwise it maybe cause delay of the Bluetooth signal).    11·  Frequency:2.4Ghz.    12·  Technology:Bluetooth V3.0 EDR.   13·  Easily charge via USB port.    14·  Play/Talk:10 Hrs.   15·  Low Battery notification.    16·  Volume /- Button.    17·  Track Forward/Backward Buttons.   18·  Adjustable Earpiece Placement.