The Casio Auto Illuminator Switch.

Ever wondered how the Auto Light switch in some Casio watches works. It's pretty simple. There is a little metal ball in a plastic case. In rest it is down a little slope. When you twist your arm towards you, that ball rolls to the top of the slops. There are two contacts at the top of the slope, so when the ball is at the top, the circuit is closed and the light turns on.

[@shythawks9549]

Smart guy you are man!

[@freeatlast1963]

Fascinating. I thought it was a static kind of sensor

[@suhaibkhalid2792]

model name of this watch?

[@eliseorodriguez7617]

What is the model on this one

[@eeyyaakk6801]

how'd you know the mechanism of this feature? did you take the watch apart?

[@thedevilsadvocate886]

Yeah and why does it only power on for a few seconds

[@sandeepchamoli1083]

Wht is the modle of this watch

[@nickcosta8062]

Well this was of no help... Thanks for wasting my time with click bait...