Circumference: 43cm (1inch=2.54cm)Color: WhiteLength of headphone cable: 27cmLength of data cable: 79cmNet Weight: 50gModel/MPN: HV-800/HB-800 (2 Models are random delivery!!)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 6-8 hours (The Volume will affect the time)9. SNR: S/N��95 10. Charging Time: 1h-2h 11. Talk time: 8-15 hours， play time: 6-10 hours12. Music Playing Time: up to 10 hours13. Frequency Response: 20 ~ 20000Hz14. Sensitivity: 80dB15. Impedance: 32 ohms16. peaker Power: 2 x 18mWNewest Wireless CSR 3.0 Bluetooth headphone headset In earphone HV-800 stereo two-channel MP3 Music Handsfree with vibration microphone for iPhone， Samsung， 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 8-15 hours. It can connect bluetooth with two devices.