Description 1. Bluetooth version: V5.1+EDR 2. Wireless frequency: 2.4GHZ 3. Support protocol: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 4. Transmission distance: about 10 meters 5. Battery capacity: earphone 50mAh, charging case 400mAh 6. Charging vol
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