Lens is
this one. Simply taped on the camera's lens. The camera is MD80 action camera. There seems to be lots of similar looking and MD80 named cameras. Cheapest are about $10, mine is from Finnish web store
verkkokauppa.com, 36 euros. This shoots 720x480 resolution. This has plastic body, 35 g with the lens. There is heavy aluminum ones too, I'd say plastic body version is better for a head cam. I had to buy 8 Gb memory card (class 6 card, 19 euros), original one wasn't enough for one hour races. Battery should last over an hour in summer temperatures, I managed to shoot a wall for 80 min indoors before it ran out of power. About ~ 65 euros at the end, one could cut it down by buying cheaper camera & mem card, lens wast the cheapest out there either. But you never know about the quality, I tried to play save here.