Manual watch

They have no mechanism for updating the time. In them there is nothing at all, except the panel with cells and a set of details of figures. But there is a complete and the most low level control over the image :)



If you have already decided that this is another useless "bicycle" -
')




This device is not just a geek clock, but a children's training simulator for teaching a kid to the perception of a digital display.

Taken from here