Tritium key Fobs/Markers. (there are other form factors if you don’t like the one pictured. Also lots of colors to choose from…or you can get the vials by themselves if you wish.

These glow fairly brightly, and are good for about 12 years, (Like night sights)

They don’t need recharging, they are bright enough to be useful, and they are as inert and solid and unbreakable as you can get.

Great for keys, or pet collars or for markers for things that you might need to find in the dark…. Like escape doors or closets where defensive tools are kept….

I use them in several places in my house.

Pretty cool and zero maintenance.

Not cheap, but not crazy expensive either. And they last for many years.

FTC: I bought my own and I get no renumeration if you buy ’em.

They are often out of stock, but that also means you get ’em freshly produced when they are back in stock