The SNJ033 solar powered 46.9mm stainless steel case is encased in a light-weight high-tech protective shell exterior with decorative metal rivets. Fitted with a scratch resistant hardlex crystal surrounded by a black aluminum rotating uni-directional 120 click elapsed timing bezel. A screw down crown with 200 meter water resistance with blue and red chrono pushers meets ISO standards for scuba diving. Equipped with a digital alarm function, LED lighting with high-visible luminous hands, markers and appendages makes this wrist watch easily legible in any environment. The chronograph measures up to to 100 hours in 1/100 second increments with full-auto calendar correct to December 31, 2100. A dive mode feature maintains dive logs, depth reading, rapid ascent notification and temperature-depth units. Seiko's own in-house movement caliber H855 is powered by light which uses direct sunlight or ambient light. Once fully charged your timepiece has a 6 month power reserve (no need for a battery) for low easy maintenance.