Need to adjust your focus up to 1.5 kilometres away from your camera? Us neither, but you can if you want by using the RT Motion MK3.1 wireless follow focus system.
Hand unit is powered by a standard Canon LP-E6 battery. We've used one for over 5 days on a single charge! (Does come with a spare and charger.. just in case.)
Steadicam, gimbal, crane, car mount, dolly, hard to think of a set up where having this would be a bad thing. The receiver is much smaller and much easier to mount (especially handy for tight gimbal builds) than a Preston or Bartech unit.