Sennheiser SpeechLine IS Series Instruction Manual page 20

Mounting and installing the products
MAS 133
Mounting the MAS 133 inline switch box
If necessary, change the position of the mounting brackets by
loosening the screws and removing the covers from the drilled holes.
Attach the mounting brackets to the desired position and replace the
covers.
Use the drilling template (see supplement) to mark the position of the
screws.
Attach the inline switch box using the supplied recessed head screws.
SpeechLine IS microphone series
10 mm –
65 mm
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