Waterproof Housing Case Cover for DJI OSMO Action 3/4, Underwater Diving Protective Shell with Bracket & Anti Fog Inserts Recycle Drying for ACTION3 Action 4, 45M

I am not sure how many people would need this case for protection underwater as the Osmo Action 4 can already be submerged without any external case. My purpose for the case is to protect the camera housing and lens from the element when using it for high speed activities. If you get blasted by pebbles or even sand at high speed it could really cause damage. This case certainly does the trick to protect the camera from the elements.It comes with ZERO instructions. Not really needed, but some type of basic instruction might help some people. It fits very well and the buttons work perfectly once the camera is inside. The seal is tight and snug, but not difficult to open and close.The only issue was with the plastic sheets that protect the lens and screen areas during shipping. Most all electronic devices ship with these sheets and in most all cases they come off easily and cleanly. The problem with this one is that the sheet that covered the lens glass left behind a very sticky adhesive. It took a bit of work to remove it.Overall, it does what it is supposed to do. Good case.