Charger voltage and current requirements 5V 0.5A and above. Charging case to charge headphones: about 60 minutes; Empty box wired charging: about 60 minutes; Earphone charging in the box: about 90 minutes; Empty box wireless charging: about 150 minutes; Headset wireless charging in the box: Approx. 180 minutes. The above values are in default Settings, 50% volume, AAC mode, the actual battery life is affected by the volume, sound source, environmental interference level (such as temperature), product features and use habits.