Bluetooth V5.1 Bluetooth Protocol A2DP,AVRCP,HFP Effective Distance 10m Playtime (hours) 4h (earbuds) + 18h (charging case) Battery Capacity 28mAh (earbuds) | 350mAh (charging case) Charging Port USB-TypeC Audio Coding aptX, SBC Driver 13mm Dynamic Impedence 28 Sound Pressure Level 94±3dB Frequency Response 20Hz-40KHz Mircophones 2 (1 on each earbud) Microphone Sensitivity -38dB±1dB IP Rating IP54 Dimension (L x W x H mm) 47.1 x 24.6 x 50.6 mm