Casio Sports Gear STL-S100H-1AJH Watch Sports Running Walking Training Watch Solar Stopwatch STLS100H A sports watch equipped with a solar charging system [Tough Solar] that converts light from sunlight or fluorescent lights into power. It features a 120-memory lap/split time function with a dedicated large front button for ease of operation. It also has 10-bar water resistance, allowing use regardless of weather conditions. Materials: Case/Bezel: Resin, Back Cover: Stainless Steel, Band: Resin, Glass: Resin Glass Functions: Stopwatch (1/100 second (under 10 hours) / 1 second (10 hours or more), 100-hour timer, with lap/split, stores up to 120 LAP data (lap counter 001-999), stores up to 60 measurement log data), Timer, Alarm, Battery indicator display, Power saving, Full auto-calendar, 12/24-hour display, Operation sound ON/OFF switching, LED light, World time Size: 51.4 x 45.4 x 12.7mm, Adjustable length (wrist circumference): 145mm - 215mm, Weight: 41g Drive system: Solar, Operating time: Approximately 11 months when fully charged, Approximately 38 months in power-saving mode, Accuracy: Average monthly difference: ±30 seconds Water resistance: 10-bar water resistance