This incredible Isotope glow fob hybrid is a cross between our timeless stainless steel Embrite™ Glow Fob and the popular TEC-S311T Isotope Tandem Fob. Combining these two products have created a "Chain Reaction" with twice the glow! The Chain Reaction Fob is designed around two light sources. First up is the Embrite™ glow pellet which can be charged with ordinary sunlight or UV light. Once darkness comes, the included glow pellet provides a large surface area to easily find anything it is attached to. Embrite™ is TEC Accessories' proprietary glow technology. It affords the brightest, longest lasting 'glow-in-the-dark’ effect available and we've manged to squeeze it into a tiny, rugged glow fob. Even the best glow in the dark material will only last so long, as it relies on "charging" by a light source to work. So this is when the second light source takes over! The installation of a standard-sized glass tritium vial (not included) will provide a continuous soft glow for many years without ever needing to charge it from sunlight or UV light. The Isotope Chain Reaction Fob is a great way to add a functional dual-glow to anything you attach it to. And best of all, you can also change out the tritium vial anytime you like for different glow colors. Use different colors to identify different pieces of gear! Complete your EDC collection with the small and stylish Isotope Chain Reaction Fob, which provides just the right amount of light for locating items in the dark, ALL NIGHT LONG. Perfect for attaching it to your keychain, camping gear, zipper pulls on gear bags or jackets, or try it on the pull chain on your ceiling fan. Where will you clip yours? TEC-SCR Isotope Chain Reaction Fob Features: Custom designed to hold a standard 3mm x 11mm tritium vial Integrated proprietary Embrite™ glow pellet, your choice of green or aqua glow color Stainless steel housing Bead blasted, uniform matte finish What you get: (1) TEC-SCR Isotope Chain Reaction Fob Your choice of Embrite™ glow pellet color, GREEN or AQUA (1) Rubber Washer (1) O-ring (3) rubber plugs for tritium vial containment (1 required plus 2 spares) (1) 11.1 mm [7/16"] diameter split ring for attachment to other items Important Note: Product DOES NOT include tritium vial