It’s similar to the weeping angels, but they lose their color (rather than mobility) when observed.

I’m not so sure… I could see a huge legitimate price range depending on its features, speed, and effectiveness. Consider the engineering difference between Billy-Bob’s “it squirts you with a hose” versus something that would clean even the body-surfacr you are reating on, and wash your face & eyelids without getting water in your nose & eyes.