Hazard 4 Heavy Water Diver Snowfield B Unisex Analog Watch 50mm Silver HWD-TI-WK-GGYG. ) Tritium bulbs don't charge by battery sun or flashlight unlike other watches using simple luminescent paint or battery-run film. They don't fade overnight like those paints and require no button pushing or battery to exhaust. They are also feather-light. Tritium lights are usually used only for critical applications like military compasses and night-sights; we nevertheless source them since our watches are used by those for whom timing can determine survival/success or catastrophe.self-contained everglow tritium-vial lamps tritium vials are not inset but 80percent above the face surface; this makes them visible from the edges not just from above titanium case is light strong and hypoallergenic large substantial 50 mm high-vis design aggressively knurled unidirectional bezel bezel has tritium marker in ''12'' porthole scratch-resistant sapphire crystal glass crystal interior is anti-reflective coated machined bezel markers won't scratch off high water resistance feature set screw-down case-back and crown the crown is large grippy and easy to turn big high-vis 3D military stencil-cut numerals unique 24-hour military time scale is integral angled minutes inner-dial for better visibility unique user-service fast-change strap pins boldly styled broad super legible hands eye-catching retail graphic case-insert easy strap changes w/ screw-in pins moisture wicking map texture under the rubber strap combined w/ relief trench & many buckle holes keep the wrist dry a selection of straps/bracelets coming soon WHAT'S INCLUDED: comes mounted with custom T.P.R. band 1x extra N.A.T.O. fabric strap 1x military-grade thermoformed travel case >> Heavy Water Diver Instruction Manual Specifications for Hazard 4 Heavy Water Diver Snowfield B Unisex Analog Watch: Manufacturer: Hazard 4 Size: One Size Application: Tactical Work Duty Around Town Gender: Unisex Dial Color: White Illumination Color: Green Yellow Band/Strap Color: Black Case Color: Silver Marker/Numeral Color: Black Color: Silver Case Finish: Matte Case Material: Titanium Case Diameter: 50 mm Bezel Finish: Green Band/Strap Material: Nylon Wrist Band Type: Strap Movement: Quartz Illumination Type: Tritium Weight: 3.8 oz Style: Original Casual Performance Seasonal/Temperature Use: All Seasons Quantity: 1 Age Group: Adults Package Contents: Hazard 4 Heavy Water Diver Snowfield B Unisex Analog Watch Hazard 4 HWD-TI-WK-GGYG: Heavy Water Diver Snowfield B Unisex Analog Watch 50mm Silver