Newest Wireless CSR 4.0 Bluetooth headphone headset In earphone， stereo two-channel MP3 Music Handsfree with vibration microphone for iPhone，for Samsung，for HTC and other bluetooth devices. This product uses the new headset shape design， using the world famous Bluetooth Stereo Bluetooth chips， to ensure high-fidelity sound quality and stable performance and excellent call quality. This product supports Bluetooth V2.1 version， support for Bluetooth A2DP and calling features. Battery time supports up to 4-6 hours.Specifications: 1. Charging voltage: DC5V 150mAh 2. Working current: 25-35mA 3. Bluetooth A2DP Working range: 10m 4. Output power: 35mW 5. Frequency range: 2.401-2.480GHz 6. Distortion factor: ≤1% 7. Frequency response: 20Hz-20KHz 8. Working Time: Music/ HuaTong state 4-6 hours (The Volume will affect the time) 9. SNR: S/N≥95 10. Charging Time: 1h-2h 11. Talk time: 4-6 hours， play time: 4-6 hours 12. Music Playing Time: up to 4 hours 13. Frequency Response: 20 ~ 20000Hz 14. Sensitivity: 80dB 15. Impedance: 32 ohm Package List:1 x Bluetooth Headset1 x Ear Hook1 x charge cable1 x Manual