AWEI GL2 Open Smart Audio GlassesDetails:1. Bluetooth solution: Zhongke Bluexun AB5656C22. Bluetooth version: BT5.43. Bluetooth protocol: A2DP, HFP, HSP, AVRCP4. Bluetooth format: AAC, SBC5. Channel system: stereo6. Microphone: omnidirectional7. Frequency range: 20HZ-20GHz8. Transmission distance: ≧10 meters9. Battery: 80mAh10. Charging time: 1.5H11. Charging voltage: 5V12. Working voltage: 3.1V-4.2V13. Speaker specifications: 9*16mm14. Sensitivity: 96±3db Impedance: 7Ω15. Play time: 6h16. Talk time: 5h17. Interface: magnetic charging18. Accessories included: glasses cloth, glasses bag, charging cable, manual