GoPro HERO 4 Black User Manual page 83

LOCKING PLUG
If you are using the HERO4 Black in high-impact sports such as
surfing or skiing where significant impact might occur, use the locking
plug to securely lock the Quick Release Buckle fingers into place. The
locking plug helps to prevent the housing from accidentally releasing
from the mount.
To Attach the Locking Plug:
1. Loop the circular ring over the thumbscrew. The circular ring
acts as a leash to prevent dropping or losing the locking plug.
2. Slide the Quick Release Buckle into the mount until it clicks
into place.
3. Press the U-shaped part of the plug into the U-shaped space in
the Quick Release Buckle.
WARNING: To avoid injury in the event of an accident, do not use
the locking plug or tether when using a mounting device on a
helmet or other personal protective gear.
/ Using the Mounts
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