Owner's manual

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3. Secure the waterproof case lock.
The waterproof case can be used with other accessories such as the
swivel T tip, bike mount, chest mount, head mount, etc.
5.1.2 Changing the T Tip Adapter
Depending on the accessories that you want to use with the case,
the T tip adapter may be detached and attached to another housing
back door or location. To detach the T tip adapter, remove the four
screws securing each tip adapter to the case.