25mAh is the earbud's battery capacity. Version V5.3 of Wireiess Transmission Range: >10M Charging Case Charging Times: ~ 6 Unit of Driver: ç13MM 5V==IA is the input. Play Time: about four hours Regularity Reaction: 20 Hz–20 kHz Time on Standby: 120 Days 320‡15% impedance 3mW is the rated power. Time Spent Charging: <90 Minutes Net Weight: 45 2g Case for Charging 300mAh is the battery's capacity. Dimensions of the charging case: 44.3*54.6*21 mm