GoPro Inc., the popular maker of tiny video cameras, is making them even tinier.

How tiny? The new GoPro Hero4 Session is the size of an ice cube, about half that of previous GoPros. It can fit into the spokes of a bike, hang onto the end of a fishing pole or turn a toddler into a documentary filmmaker.

The Session goes on sale July 12, and GoPro gave me one to try over the past week. It isn't the best-quality camera GoPro has ever made, but it's so small and simple, I'm likely to keep using it.

Just brace for the sticker shock: $400. That's the same price as an Apple Watch, not to mention last year's Hero4 Silver, which has a touch screen and better picture quality.