Perpetual Solar Alarm Chronograph, powered by light energy, 6 month power reserve once fully charged, power reserve indicator leap year, month, day, and date indicator, LumiBrite hands and markers, sapphire crystal perpetual calendar adjusts for odd and even months including February of leap years up to 2100 chronograph measures up to 60 minutes in 1/5 second increments with split time measurement function when the measurement reaches 60 minutes, the stopwatch automatically stops counting, screwdown caseback, caliber V198