Use The Speakers - Nokia MD-8 User Manual

ENGLISH
the battery cover, insert the catches on the cover into the corresponding
slots on the speakers, and press the cover toward the speakers to snap it
into place.
To remove the batteries, open the battery cover, and lift the batteries from
the compartment.
During long periods where the speakers are not used, remove the batteries
to prevent damage from battery leakage.

Use the speakers

Lift the audio plug from the slot at the back of the speakers, and uncoil
the speaker cable.
To connect the speakers to a compatible Nokia device that has the Nokia
3.5-mm AV Connector or a compatible device (such as a PC or music
player) that has the standard 3.5-mm audio connector, insert the audio
plug into the connector on your device.