Specification:Bluetooth specification: V4.0Frequency range: 2400.0-2483.5MHzBluetooth、 headset、 handsfree、 A2DP and AVRCPBluetooth chip: CSR8635Transmission distance: 10 metersCharging time: 1-3 hoursTalk time: 7 hours or morePlay time: 8 hoursStandby time: 250 hours or moreWeight: 18 gramsFeatures:1) Super multipoint connection to 8 bluetooth enabled devices at the same time;2) High fidelity audio quality、 echo-eliminating and noise-reducing techniques for clear hearing;3) Built-in microphone with intelligent noise reduction for best HD voice、 communicate with your friends clearly without hindrance;4) Sports earplug elastic headset design、 lightweight and stylish、 comfortable for long time wearing、 the best companion for people who like to do outdoor activities;5) With voice dial function、 built-in buzzer for reminding incoming calls、 automatically switch to talking mode when calls income and continue playing music when calls end;