Camera Case
You must perform proper care and maintenance for the camera case (Caring for the Removable Camera Case). Failure to perform proper care and maintenance may cause damage to the removable camera case or gasket and allow water to leak into the case during use. Exposing the camera to water will cause permanent damage to the camera and battery, which may present a risk of fire, chemical burn, electrolyte leak, and/or injury.
The included camera case provides rugged protection for your camera, and it provides water protection when used with the watersports camera case door.
Two camera case doors are included in the package.
The watersports door 
is installed on your camera case by default. The altimeter door 
is included in the box. You can quickly change the camera case door based on your activity.
While the watersports door is installed, the case is water-resistant up to 40 m and is suitable for many water activities, including swimming, snorkeling, and high-speed watersports. The altimeter sensor does not function while the watersports door is installed.
While the altimeter door is installed, your device records more accurate elevation and grade data, and additional G-Metrix™ data, including jump height and vertical speed. The altimeter door provides an IEC 60529 IPX7 water rating suitable for rain and light splashes. The altimeter door is not suitable for watersports, immersion, or other exposure to water or other liquids.
Go to garmin.com/waterrating for more information about water ratings and suitable water activities.