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 blue 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, with stainless steel case and durable black silicone strap, includes a blue uni-directional rotating elapsed timing bezel and secure screwdown crown and caseback. 200m Water Resistant