. bluetooth version: v5.4 zhongke bluexun ab5656c2
2. channel system: stereo
3. supported protocols: hsp, hfp, a2dp, avrcp battery capacity: 35mah
(without protection board, headphone board lithium battery protection ic)
4. charging compartment battery capacity: 300mah (with protection board)
5. talk time: 4h
6. music time: 5h
7. charging time: 2h
8. speaker specifications: φ14.2mm
9. impedance: 16ω
10. standby time: 200h
11. input charging standard dc 5v
12. sensitivity: 110±3 dbdb
13. bluetooth operating frequency: 2402-2480mhz
14. frequency response range: 20hz-20khz