A solar powered radio controlled wrist watch with gesture controlled light switch rocks. Where we are going, we don't need hands ; ) one hand might be perfectly enough.
With one hand but not two, wrist watches are an issue or a subject.
Since over 10 years, I am a huge fan of Casio's solar powered radio controlled watch series. Clearly, they are always running and always precise. However the Casio GW-M5610 model with radio control and solar power adds an extremely clever feature - motion or gesture switched backlight.
Now, the trigger motion for turing the light on is holding the wrist flat then turning it towards the body amounting to a 40 degree pronation of the forearm. If the ambient light is low or dark, then the backlight will come on for a moment.
While "that is it", it is the first gesture controlled consumer product that I find immensely useful given the handicap.
You want me to repeat that?
Here is a more dedicated review that I found by someone else on Youtube.
Someone else presents the automatic light function, using some other Casio watch model, also on Youtube.
However, my own Youtube video is a perfect example of getting to the bottom of it, a shining example of brevity. It certainly answers the question: How would Hemingway have done this?
You would assume that Ossur that bought Touch Bionics ("caring" for the iLimb), Otto Bock that bought BeBionic, or Otto Bock that has the Michelangelo, would have used motion control to solve existing problems such as positioning interference with myoelectric control. But, no. Casio definitely stole that show.
The watch weighs 48 grams. Solar powered, radio controlled. Gesture controlled light switch. At night, and without glasses on, no more guessing what time it is. Cheers, guys : )