The Casio STL-S100H pairs a black resin case and strap with gray bezel accents and green lettering on the labeled side buttons. Large digital time numerals sit between smaller upper and lower display sections, while exposed screw details and a prominent front start/lap button give it a sporty layout.
Tough Solar charging powers a rechargeable battery. A 120-lap memory and dedicated start/lap button make timed sessions easier to track, with five alarms, Illuminator lighting, and 10-bar water resistance adding practical everyday features. This is the Japanese domestic market (JDM) version.
