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The Isotope Photon is a compact 2.54″ keychain light with a titanium housing finished in bead blast matte. It’s designed to hold a single 3mm x 23mm tritium vial (sold separately), which provides long-lasting, battery-free illumination. The housing features a spring-loaded, shock-absorbing design to protect the internal borosilicate glass tube, and water-resistant O-ring seals on both ends help maintain durability in wet conditions.
