Sennheiser Evolution Wireless Digital Series Instruction Manual page 76

To insert the belt clip:
Insert one side of the belt clip first as shown in the figure.
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Then insert the second side of the belt clip.
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Gently press the belt clip all the way in on both sides.
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Always insert one side before the other, not at the same
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time, as otherwise the belt clip could bend.
EW-D SK bodypack transmitter
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