Meet the Pentax WG-M2: a waterproof, shock resistant, and coldproof action 4K action cam with an ultra-wide-angle lens. You can take it to depths of up to 20 meters with no housing. The device has 7 image effect moves and built-in WiFi.
The WG-M2 comes with a 204-degree wide-angle lens. It can work in temperatures as low as 14F. You can capture 4K videos with it at 30 fps. Costs under $300.