Product Specification 1.Model Number:M7 2.Charging Input:USB Cable 3.Frenquency Range: 2.04GHz-2.480 GHz 4.Normal Temperature:-20/+60℃ 5.Quality Sound:high-quality Bluetooth wireless with pure natural sound with aptX Technic. 6.Talking time : Up to 5 hours  7.Playing time: Up to 4 hours 8.Ergonomically designed to comfortably fit the contours of your ea 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