Helmet camera, who uses one?

[Tev62]

I use an old Go Pro 4 Black with a battery eliminator cable which plugs into a low cost power bank. The power bank powers the GoPro for a week or more depending on use. It's a very low cost setup and saves constantly changing GoPro batteries. Negatives are 1)It doesn't get you a rear view and 2)it doesn't know if you've had an accident!