Specification:1. Item: bluetooth Earphone2. Color: Black3. Connection: bluetooth 4.14. Driver Unit: φ10mm5. Impedance: 16Ohm±15%6. Sensitivity: 90dB±3dB7. Frequency Response: 20-20000Hz8. Maximum Power Input: 0.5mW9. Battery Capacity: 100mA10. Mic Impedance: 2.2K Ohm±15%11. Mic Sensitivity: -42dB±3dB12. Mic Frequency Response: 30-16000HzFeatures:1. bluetooth 4.1 and ceramic antenna cooperation, improves the signal coverage, more stable for voice chat.2. Waterproof surface material, helps to avoild the sweat erosion, more suitable for sport running use.3. Ear-hook design, not easy to fall off.4. Smart noise-cancelling intechnology, strong anti-interference capability, voice chat gets more clearly.5. Support dual phones connecting, easy to switch to.6. Energy-saving, supports listening to music for 7 hours or for a 10-hours call.Package Included:1 * Wireless bluetooth 4.1 Waterproof Stereo Earphone Sport Earphone for iOS Android