12. How long does EH3 NC last and how long does it take to be fully charged?

A: EH3 NC uses 1000 mAh battery. At normal volume, pure Bluetooth mode lasts about 50 hours and Bluetooth + noise reduction mode lasts about 30 hours.
3.5mm audio cable can be inserted as a wired headset when no electricity is available.
Charging time is about 2-3 hours.