gutsyman business bluetooth earphone wireless headset with micphone handscalls for smart phones

features:.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/n95.10. 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. impedanc