features: Adjustable head band,super style and sound assured. Enjoy music wirelessly from Bluetooth-enabled computers,PDA,MP3/CD players and more. Built-in Microphone, answer to the phone calls when paired with mobile phone. Built-in rechargeable Li-on battery, charge directly from USB port. Up to

features: Adjustable head band,super style and sound assured. Enjoy music wirelessly from Bluetooth-enabled computers,PDA,MP3/CD players and more. Built-in Microphone, answer to the phone calls when paired with mobile phone. Built-in rechargeable Li-on battery, charge directly from USB port. Up to 20 hours music time, 400 hours stand by time. Wirelessly enjoy stereo music from all A2DP enabled devices, such as iPone 4 5 iPad, PC/laptop, PSP, laptops Specifications: Bluetooth: V3.0 EDR Frequency: 2.4Ghz Frequency response: 20-20000Hz Speaking impedance: 32 ohm Transfer Distance: 33ft /10m Play/Talk: 10 hours Color: same as picture Charging time: About 3 hours Charging via 2.5mm DC jack. Driver Unit: 30mm Impedance: 32 ohms Sensitivity: 115dB /- 3dB Frequency Response: 20Hz - 20KHz Normal Input Power: 10mW (15mW Max.)  Bluetooth specification: V2.1 EDR Bluetooth profiles supported: HSP, HFP, A2DP and AVRCP Operating distance: 10 meters Class 2 Rechargeable 245 mAH Li-polymer battery Charge input voltage: DC 5V Compatible with : Bluetooth devices, such as iPhone, iPad,smart phones