Digital Number Display

Factual Questions
1

I’m looking for an electronic handheld number display. Something like they use for substitutions in soccer. The numbers would need to be visible from about 100’ away in daylight and easily changed. Maybe a keyboard on the back or something. Three digits would work. I can’t find anything on amazon but maybe I’m not looking hard enough. Does it exist?

2

You want an LED sign board - something like this one on Amazon

VEVOR Programmable LED Sign, P10 Full Color LED Scrolling Panel, DIY Custom Text Pattern Display Board, WiFi USB Control Message Shop Sign for Store Business Party Bar Advertising, 99x35cm : Amazon.com.au: Home

Its about a metre in long dimension, which might be sufficient for your distance. Not cheap though.

3

I think those substitution boards are four digits; two each for the outgoing and incoming player. Here are some Amazon listings.

4

Might be too small to be seem at 100’:

Or this on Amazon