Nylon Strap. Self-Illumination System glows for over 25 years. Black Dial. Screw Down Crown, Rotating Bezel Hardened Mineral Crystal. High Quality Swiss Component Movement. Water Resistant to 200 meters.3 Year Battery 1 Year Warranty.
Tritium: Tritium is a gas that glows when it's exposed to a reactive dye. It provides a bright light that will glow reliably for 25 years. These markers do not require any battery power or other form of charging.