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Product Description: Features: 100% brand new and high quality. This wireless Bluetooth hands-free headset provides a quiet and comfortable listening experience. Specially designed with an in-ear style that gives you ultimate comfort and fit. Stylish design and advanced technology, you will be cool and stylish once wearing it. CVC 6.0 Noise reduction, clear talk while liberating your hands, keeping maximum comfort while looking good. Bluetooth chip and Bluetooth version: 4.1 Bluetooth protocol: A2DP AVRCP HFP HSP Battery: 3.7V 60mAh charging power: 5V / 80mAh Sensitivity: 103db +/- 3dB Impedance: 32Mw Transmission distance: accessibility 10m Frequency: 2.4GHZ talk time: about 4 hours songs time: about 5 hours standby time: about 160 hours Product Weight: 14g Functional description: Play music, music up and down music switch. Volume adjustment, voice switching in English. Call voice number function. The last redial. Operating voice prompts. IOS system shows the power. Package Includes: 1PC Bluetooth Headphones 1PC USB charge cable 1PC User manual