The dome port works as advertised and greatly improves my underwater photos and videos. The material is plastic, not glass, but that doesn't seem to affect the picture quality, which is great for clear water. I recommend tightening all the small screws around the rim with the wrench provided to prevent leakage. My only gripe is that it comes with small anti-fog strips but doesn't come with instructions on where to put them, but I've had no trouble without fogging up the strips.
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