Product Specification  1.Model Number:M9  2.Charging Input:Micro USB port  3.Frenquency Range: 2.04GHz-2.480 GHz  4.Ambient Temperature:-20/+60℃  5.Porfiles Supported: Headset?handfree ?A2DP/AVRCP/APTX  6.Talking time : Up to 5 hours  7.Playing time: Up to 4 hours  8.Stand By time: up to 100 hours.  9.Charging time : about 0.5-1 hour  10. Bluetooth version :4.0  11.Transmission Distance: 10mPacking :  1* Bluetooth headphone  1* USB charging cable  2* Earhook  1* User Manual Website:http://www.amicooshop.com