GOWE Rights(Private Mould) Bluetooth 2-Channel Stere Earphone Headset Wireless Headphones,Call duration:6.8 hours Support one driving two bluetooth devices Voice control of YES/NO answer 2-channel stereo Frequency: 2.4-2.48GHZ Transmision distance:10.1m Protocol: A2DP/HFP/HSP/AVRCP Battery cell:115MA polymer Call duration:about 83 hours Standby duration:about 183 hours Music play duration:about 6.8 hours Charging time:about 1.1 hour Charging Voltage:5V Support one driving two bluetooth devices Voice control of YES/NO answer Voice prompt/Re-dial Call number prompt