While the Hero 9 camera is waterproof down to 33', sometimes you just need to go deeper. That's where this housing comes in. With it, you can now go truly deep...up to 196' according to the manufacturer. The best part is that you don't lose any image quality, as the lens port is actual glass instead of plastic.

It is also very useful for when you want to protect the lens of the GoPro from debris like rocks, dirt, and salt spray. Think of it like a little suit of armor for your beloved camera.