Bluetooth V5.4 Bluetooth Protocol A2DP, AVRCP, HFP Effective Distance 10M Playtime (hours) Earbuds: about 7h;Charging case: about 19h Total: about 26h Battery Capacity 3.7V 37mAh(earbuds) |3.7V 350mAh (charging case) Charging Port Type-C Input 5V 200mA (earbuds) |5V 1A (charging case) Charging Time 1.5h (earbuds) | 1.5h (charging case) Weight 41g