1. Bluetooth version: Bluetooth v4.0 + EDR2. Bluetooth mode:hands free/headset3. Power Level: CLASS II4. Bluetooth distance: 10 meters barrier5. Radio Frequency : 2.402-2.480GHz6. Battery type:50mAh rechargable polymer battery7. Talk time about 4 hours8. Music play time about 3 hours9. The standby time is about 3-4 days10. Powerful noise noise cancellation circuit (Active Noise Reduction)11.Supports Two Mobile Phones Simultaneously Connected.12.Long battery life， fast charging.13.Compatible For Almost All The Mobile Phones And Tablet PC， etc.Package Contents:1 x Bluetooth Earphone1 x USB cable1 x USB manual