Sena RUMBA Quick Start Manual page 8

Bluetooth multi-sport helmet
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QUICK START GUIDE
5. Secure the excess strap with the "O-Ring" and then
attach the "Chinstrap Pad".
Note: Check the chinstrap's position and tension regularly to
ensure proper fit.
6. Turn the retention system knob clockwise to tighten
or counterclockwise to loosen.
WARNING: For maximum protection, this helmet must be fitted
and attached properly to the wearer's head in accordance with the
following instructions. If after adjustment the helmet does not fit
properly, do not use the helmet. Return it to the retailer or Sena.
Retention System Knob

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