Recommendations for clip on collar light that allows you to change/select a specific color?

Sometimes there's multiple dogs at the park with collar lights that are the same color, so it's hard to tell who is who in the dark.

Could anyone recommend lights (ideally in a 2 pack from amazon) that allow you to change/select the color you want? Most seem to be white/red/rainbow where it cycles through all the colors automatically.

I'm aware of the Nite Ize Disc-O ones, but they're pretty expensive, especially if I wanted to buy 2.