wireless bluetooth headset 1.USB wireless headphone 2.headphone for computer 3.headset with mic 4.hi-fi Stereo sound wireless bluetooth headset manufacture with mic for iphone/mobile phone Basic Specifications ... 5MHz ModulationGFSKReceiving distance and range360 stopni, 10mProduct picture: wireless bluetooth headset manufacture with mic for iphone/mobile phone Delivery 1.Usually by EMS, DHL, UPS, ...