GoPro Hero4 Silver Quick Start Manual page 12

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Housing Backdoors
Your HER04 Silver camera comes with three backdoors, each designed
for different uses and environments.
STANDARD BACKDOOR
Provides waterproof protection to 131' (40m).
Use when shooting under water or in wet, damp
or dirty conditions.
TOUCH BACKDOOR
Enables access to the camera's touch display.
Provides waterproof protection to 1 0' (3m).
(Touch functionality not available under water.)
SKELETON BACKDOOR
Not waterproof-use in dry, dirt-free environments
only. Enables enhanced audio capture during
low-speed activities.