Glow Necklaces have remained one of the hottest products on the light-up market for years & they're still going strong! Glow Necklaces contain a non-toxic, glow-in-the-dark chemical that illuminates once activated. To activate, simply bend the necklace until you hear it crack. This will release the chemical within the glow necklace and it will immediately start to GLOW! They will last approximately 6 - 8 hours once activated. To attach, connect one end to the other using the clear connectors included with each set. These can be used for Parties, Favors, Raves, and so much more!