The Sony Action Cam Replacement Doors (2 Pack) includes two different doors that are compatible with the waterproof case that's included with your Sony Action Cam. The first door features a flat lens, which is ideal for shooting under water. The second door features a tiny opening located near the camera's built-in microphone. This door affords improved audio capture. Both of these doors are designed so that no matter the shooting scenario or the conditions, you'll always be able to capture the best video and audio possible.