AmazonBasics B07PDYW6VM Instruction Manual page 12

Auxiliary input mode
Connect an 3.5 mm audio cable (not included) to the AUX
IN socket (B) and to the desired playback device e.g. MP3
player.
Music playback
: Press to play/pause the playback.
: Press to skip to the next track.
: Press to return to the previous track.
Calling
: Press to accept/end call.
: Press and hold to reject call.
Volume control
NOTICE
: Press and hold to increase volume.
: Press and hold to decrease volume.
12
The volume of the playback resets
to the medium volume after each
start up.