Bluetooth V5.1 Bluetooth Protocol HFP, A2DP, AVRCP Effective Distance 10m Playtime (hours) 7h(earbuds) + 21h(charging case) Battery Capacity 37mAh (earbuds) | 350mAh (charging case) Charging Port USB-TypeC Audio Coding SBC Driver 13mm dynamic Impedence 32 Sound Pressure Level 94±3dBSPL Frequency Response 20Hz - 20KHz Mircrophones (1 on each earbud) Microphone Sensitivity -38±1dB Gaming mode