Retevis RT56 Manuel D'instructions page 8

Install Belt Clip
Remove battery firstly and aim belt clip at two screw holes on transceiver, then screw on by
screwdriver. Unscrew to remove belt clip.
Install External Loudspeaker/Microphone
Open rubber plug and insert loudspeaker/microphone into jacks.
Warning: Do not insert/pull out external loudspeaker/microphone
in explosion-proof locations.
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