Prospex Solar Diver s Watch. Designed for those who treat life as the ultimate adventure, Seiko Prospex keeps moving forward, meeting every challenge with technological excellence and winning design. Upgraded with a larger case, but a sleeker and thinner profile, plus a scratch-resistant sapphire crystal, this handsomely tailored and superbly functional diver s watch features an energy-efficient solar cell, powered by any light source, with no battery change required, and providing a 10-month power reserve when fully charged. The highly legible black dial includes a date calendar and LumiBrite hands and markers. Following ISO standards for scuba diving at depths of up to 200 meters, this exceptional timepiece, crafted of stainless steel, includes a blue and red uni-directional rotating elapsed timing bezel, tri-fold push button release clasp with secure lock and extender, and screwdown crown and caseback. 200m Water Resistant