Firefly MegaGlow Tritium safety markers allow equipment and positions to be covertly marked during low-light and darkness. Incorporating the largest light source available, MegaGlows can be identified or located at distances of up to 40m without resorting to electric or chemical lights. Simple, reliable and effective, operational efficiency and safety are enhanced during darkness Uniquely reliable trigalight® light source Uses the largest trigalight® GTLS available Continuously illuminated for more than 10 years No batteries, bulbs or switches No charging by ambient light Lightweight, compact and easy to use Split-ring included for secure attachment No heat signature Reliable in all climatic conditions Nine Colour options for function differentiation MegaGlows are moulded in clear grade V0 polycarbonate, providing a tough protective enclosure and making them highly shock resistant. Stainless steel end-caps provide an attractive yet durable finish. Enclosure Material: Clear grade V0 polycarbonate End-Cap Material: Stainless steel Dimensions: Diameter 10.5mm, length 41.0mm Split-Ring: Diameter 18.0mm Weight: 8g