>I mean, it's a hard problem - for many reasons you only have one button, with no way to display information. Yes, there is a way to display information: put a

>I mean, it's a hard problem - for many reasons you only have one button, with no way to display information. Yes, there is a way to display information: put a screen on the device. My bicycle headlight has this: https://www.niterider.com/products/6780-lumina-oled-1200-boost https://www.niterider.com/products/6780-lumina-oled-1200-boo... Of course, this costs more. The OLED screen version of this headlight costs significantly more than the plain one-button version.