Condition:Used An item that has been previously used. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or an item that has been returned to the seller after a period of use. See the seller’s listing for full details and description of any imperfections Features : International top tuning team designed High strength sweat proof design MicBluetooth 3.0 Noise Reduction Stereo 96KHZ Talk/ playing time up to 5Hours Standby time 180 Hours Power source:Built-in Li-ion Battery (USB Charging) Support system: IOS, ANDROID, WINPHONE, SYMBIAN , MAC OSX and WIN7/8 This item is in a really good condition and has rarely been.