The best helmet cam i've found - MOHOC Elite Ops 12MP Helmet Camera, 1080p HD Video

This unit is super well-built and the low profile is a big plus. It does everything very well. The picture/video quality is outstanding and it does it all without announcing that you are recording and does not make a sound. Plus, you can work it blindfolded. The only thing I would add, and that is because I use it to document disengaged, texting, etc drivers trying to kill me on my motorcycle, would be a "hard-hit save" feature. Most dash cams have this feature that saves the preceding 5 minutes or so of video if it senses a hard impact. The only way to save video on the MOHOC is to turn it off. That would be OK if one was not unconscious or seriously injured. Not much else that I would ask for. I'm very happy with this cam.