Attach to car keys, house keys, bags, tents or even your pets, for a super long lasting and bright glow that can go on being charged for years to come - one day you will be glad you did! This Glow in the Dark Keyring is made from a super tough resin and powerful glow crystals of strontium aluminate which are ten times brighter and glow much, much longer than cheaper zinc sulfide glow products. The keyring will absorb light in the daytime and release the energy as a bright green glow when dark, the longer and brighter the exposure to light is, the longer and brighter the keyring will glow. With no batteries to worry about this keyring will glow for many many years and has endless uses. Will glow in the dark for many years Wipe clean Extremely strong and durable No batteries 4cm x 2.3cm (1.5" x 1") Includes metal key ring Odour proof (suitable for pets) Rot proof