Find things at night with Ni Glo, a glow in the dark keychain and marker for keys and all kinds of outdoor gear including backpacks, tents and SCUBA tanks. This rechargeable key fob is battery and tritium-free. Read more..Specifications and Features: Easily attaches to keys, packs, dog collars, guylines, tent zippers, hammock clips, night fishing rods and scuba tanks Charges within 10 minutes by sunlight, indoor light, flashlight or headlamp Glowing light can be seen up to 25 ft. away; Use it to mark a dive site, campsite, hiking trail or the distance from a hunting blind IPX8 waterproof, dust-proof, and weatherproof Materials: Strontium oxide in plastic with stainless steel keyring