Titanium, Lithium & Tritium continuous illumination... simply the best. The A-4T Super Yankee Illuminated design is inspired by vintage U.S. Military field watches. It features an impressive list of non-compromised performance features, materials and components… the result is a field watch that is unmatched in the market… delivering long term field proven reliability, accuracy, illumination performance, durability, and light weight Active Comfort.