Nokia MD-3 - Manual (Page 3)

ENGLISH
To use the speakers with the AC-4 charger, connect the charger to a wall
outlet, and plug the charger cable to the connector at the back of the
speakers.
Use the speakers
To connect the speakers to the phone or audio device, plug the speaker
cable into the connector on the device. The speakers can be used with
compatible Nokia adapters. To use the speakers with a Nokia adapter,
connect the adapter to the device and the speaker cable to the adapter.
To switch the speakers on or off, press the power key located at the top
of the speakers. When the speakers are switched on, the green indicator
light is on.
To set the volume, use the slider at the top of the speakers. If the sound
level of the speakers becomes too low when using battery power, change
the batteries.