Product DetailsSport Wireless Bluetooth 4.1 Stereo Ear-hook Earphones Ergonomic Bluetooth Earsets Key ... Specifications/Special Features:Features:Sport wireless Bluetooth 4.1 stereo ear hook earphoneBluetooth: V4.1Drive unit: 8mm ... hoursCharge time2.5 hoursFrequency range20-20KhzSupport profilesA2DP,AVRCP,HFP, HSPButtonVol-. Vol+, Pre, Next, Play/Pause, Power on/Power offDistance10mOEMacceptPort ...