Prospex Speedtimer Solar Chronograph. Designed for those who treat life as the ultimate adventure, Seiko Prospex keeps moving forward, meeting every challenge with technological excellence and winning design. This rugged and stylish watch is a part of a high-intensity collection inspired by classic motorsports in the 1970s, when Seiko?s original 1969 ?Speedtimer,? the world?s first self-winding chronograph, was at its prime. Reflecting the theme of a circuit race, the black and gold accents of the dial and tachymeter bezel evoke racing with extraordinary speed and excitement. The chronograph function measures up to 60 minutes of elapsed time in 1/5-second increments and includes a split time function, while the solar cell, powered by any light source with no battery change required, provides a 6-month power reserve when fully charged. The black dial with gold accents features three black subdials with a 24-hour indicator and power reserve indicator, as well as a date calendar, and LumiBrite hands and markers. Crafted of stainless steel, this sporty model includes a curved anti-reflective sapphire crystal, secure screwdown caseback and tri-fold push button release clasp. 10 bar, 100M Water Resistant Case: Two-tone stainless steel case Case Diameter: 41.4mm Case Thickness: 13.0mm Case Length: 45.9mm Crystal: Curved sapphire crystal with anti-reflective coating on the inner surface Water Resistance: 10 bar, 100 meters (330 feet) Dial Color: Black Strap: Stainless steel bracelet Lug Width: 21mm Movement: Solar Chronograph Caliber V192 Powered by light energy - no battery change required 6-month power reserve once fully charged