Start ready to use
A Runcam helmet cam 4k
Comes inc:
a better l-ion 3000mah battery samsung sd card
Fast helmet rail and stabilizer clip
To get through almost an entire day of skiing, the battery life can be extended by connecting a USB power bank.
Camera can record multiple types of video, such as 1080p 60 fps, 2k 60 fps and 4k 30 fps.
I used it myself to see if I liked filming and it did, but now I use a DJI so I can throw this one away.
New price is around €80 excluding SD card and better battery.
The lens is scratch-free, but the adhesive on the stabilizer has worn out, so you'll need to replace it with some glue or something similar. Officially, it comes with a mounting clip that you stick to the helmet, but I didn't find it stable enough, so unfortunately, it's not included.
Pick up or shipping, buyer's costs.