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

1. Bluetooth version: V5.1+EDR2. Bluetooth protocol: A2DP1.3/HFP1.6/HSP1.23. Chipset:Bluetrum 5376 4. Shell material: ABS+PC5. Charging time: 1 hour6. Bluetooth distance: 10m-15m7. Earphone battery capacity: 30mAh*28. Standby time: 240Hours9. Play/Calling Time: 2-2.5 Hours 10. Charging box battery capacity:200mAh11. Speaker model: φ 13. Round horn12. speaker size: φ 13mm13. Impedance: 320 Ω14. Rated power: 3mW15. Maximum power: 5mW16. Frequency response:20hz- 20Khz17. Charging time of charging box:1.5-2 Hours18. The mumber of times the charging box charges the headset: 3 times19. The blue lights of main and auxiliary /TWS connection success indication: engines flash slowly at intervals20. Single headphone weight：7g21. Single headphone size：3.1*1.6*1.6cm22. Charging box weight：19g23. Charging box size: 4.4*4.3*2.1cm