Tritium vials come in a variety of colors, and will glow for many years without requiring any type of "charging" from sunlight.
Tritium key rings can attached to any item you wish to identify in the dark. You can clip it between a backpack zipper and flashlight, between one of our P-7 clips and a pocket tool, or even between the pull chain and pull knob on a ceiling fan...the uses are endless! Most keychain lights have batteries that only last a couple months before needing to be replaced. But what if you could have Tritium Keychain, which lasts about 10 years without needing to be replaced?