Rechargeable AAA* batteries can be used in PSB M4U headphones. The average battery life varies depending on the battery type installed.
M4U 8 / M4U 8 MK II headphones models support charging (cable supplied).
Note: The 3-Position Power switch LED Indicator flashes Red when charging and turns off when fully charged.
IMPORTANT! – * DANGER OF EXPLOSION IF BATTERY IS INCORRECTLY REPLACED. PLEASE DO NOT USE ANY OTHER BATTERY TYPE. THE WRONG BATTERY TYPE WILL DAMAGE THE HEADPHONES.