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HXSJ Air-S4 Bluetooth 5.1 True Wireless HiFi Stereo Earphones with Charging Case (Black)

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Bluetooth version: V1+EDR
Bluetooth protocol: A2DP3/HFP6/HSP2
Chipset:Bluetrum 5376
Shell material: ABS+PC

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1. Bluetooth version: V5.1+EDR
2. Bluetooth protocol: A2DP1.3/HFP1.6/HSP1.2
3. Chipset:Bluetrum 5376
4. Shell material: ABS+PC
5. Charging time: 1 hour
6. Bluetooth distance: 10m-15m
7. Earphone battery capacity: 30mAh*2
8. Standby time: 240Hours
9. Play/Calling Time: 2-2.5 Hours
10. Charging box battery capacity:200mAh
11. Speaker model: 13. Round horn
12. speaker size: 13mm
13. Impedance: 320
14. Rated power: 3mW
15. Maximum power: 5mW
16. Frequency response:20hz- 20Khz
17. Charging time of charging box:1.5-2 Hours
18. The mumber of times the charging box charges the headset: 3 times
19. The blue lights of main and auxiliary /TWS connection success indication: engines flash slowly at intervals
20. Single headphone weight7g
21. Single headphone size3.1*1.6*1.6cm
22. Charging box weight19g
23. Charging box size: 4.4*4.3*2.1cm