Spescifications:Headphone Type: Both left and right ears can be usedBluetooth Version:V4.1 + EDRBluetooth Profiles: Hands free/HeadsetSupporting Agreement: HEP/HSP/A2D/AVRCPTransmission Range: more than 10 metersBattery Type: 55mA rechargeable lithium batteryCharging Time: about 1h-2hWorking Time: Music 4-6 hours (The Volume will affect the time)Standby Time: about 100-150 hoursFrequency Range: 2.40-2.48GHzDistortion factor: ≤1%Frequency Response: 20Hz-20KHzWearing Styles: in-Ear/stealth headphonesFeatures:

Made of high quality material, durable and practical to use                                Bluetooth 4.1 master chip, support 10 meters hands-free date connection                                Talk, listen to music                                Built-in DSP audio processing system, can eliminate noise and echo very well                                Ensure clear communication and music                                Safe battery protection to ensure working hours up to 3 hours                                The headset connects two Bluetooth devices at the same time, such as for Iphone for Samsung                                For Huawei and other mobile phones, PCs, PADs and other devices call, music, games