CM socket. VIDEO ATTACHED. I took it to the beach and was amazed at what I pulled off. Takes some amazing 50/50 shots! An unexpected benefit is that the sound is much better with a dome than with a GoPro alone. If you're only using a GoPro, water will stay in the mic port and muffle the sound terribly. With the dome I can still hear voices and sounds through the body (although still a little muffled, it's much better than without the dome). A mini wrench for the dome screws is included. You might tighten up a bit when you first get the dome. Customer service is incredible.
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