Prospex Solar Analog-Digital 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. Featuring the new H855 caliber movement, this rugged and dynamic timepiece commemorates the 40th anniversary of the H558-5000, introduced in 1982 as the world’s first analog-digital hydrid diver’s watch with an alarm and chronograph. Essential equipment for the Japanese Antarctic Research Expedition during the early ’80s and on the Japan/China/Nepal team’s 1988 Mt. Everest challenge, this iconic watch also gained a cult following as an ’80s action movie favorite. Upgraded to meet the special demands of deep sea diving, this new design includes such indispensable functions as a diving log, depth meter with auto start and sudden ascent alarm, and a water temperature measurement function, and follows ISO standards for scuba diving. The rich black dial, with LumiBrite hands and markers, offers an enlarged digital display for improved visibility of the chronograph, alarm, time, date, local time, and power reserve readouts. Crafted of stainless steel, this extraordinarily durable timepiece features a screw-down crown, pushers and caseback, uni-directional rotating elapsed timing bezel, and tri-fold push button release clasp with secure lock and extender. The energy-efficient solar cell, powered by any light source, with no battery change required, provides a 6-month power reserve when fully charged. 200m Water Resistant