The Leatherback Sea Turtle Giant watch gets its name from the design of the watch, the classic Luminox case with the protected crown balanced by an opposite outcropping, resembles the shape of a turtle. With a 44 mm CARBONOX™ case and water resistance up to 100 meters, its black dial with white numbers provides maximum readability during the day. At night, the proven Luminox Light Technology lighting system assumes this function. "Always Visible", self-powered, for up to 25 years.