Airdopes 91 Category Wireless Earbuds IPX Rating IPX5 Driver Size 2 x 13mm Music Playtime Up to 45H Frequency 20Hz-20KHz Battery capacity 300mAh (Case) 35mAh*2 (Earbuds) Latency with BEAST™ Mode 50ms Charging Time About 30min (Earbuds) ; up to 1.5 hours (Case) Transmission Range 10m Bluetooth Version V5.3 Net Quantity 1 Unit Charging Interface Type C