The unit can be powered by either a battery pack or an AC power adaptor.
A Nickel-Cadmium battery pack of 12 Volts/2AH capacity is used. It is replaceable and
rechargeable. An audible alarm sounds when battery voltage drops to its lower limit.
The battery can be recharged while in the mixer or with a separate battery charger unit.
The battery can be recharged while the mixer is in use if the AC power adaptor is
attached at rear panel jack of main unit. The battery can also be recharged by removing it
from the mixer and connecting it to a separate battery charger unit.