Beyerdynamic Opus 100 Mk II Notice D'utilisation page 32

Removable belt clip can be rotated 360°. To remove use a screwdriver at an angle of
8
45 degrees.
3.2 How to insert or change the Battery
1. Press the two snap locks on the right and left of the battery compartment and open it.
Remove the battery.
2. Insert a new battery into the battery compartment observing polarity markings. Then
close the battery compartment again.
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