Bluetooth chip model:RTL8753BFR, Bluetooth version: 5.1 Earplug battery capacity: 50mAh, Charging box battery capacity: 350mAh Charging time: 1H, Endurance time: 5H Operation mode: touch, Waterproof rating: IPX7 Certification: meet CE compliance. Have logo on the charging box & headphones label on the retail box Comes with retail box. Support Profiles: HSP, HFP, A2DP, AVRCP, Operation Distance: 10m, Transmitting Power: Class 2, Frequency Range: 20Hz-20000Hz, Charging port: TYPE-C, Sensitivity: 120dB+ / - 5dB.syi
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