Solar Alarm ChronographPowered by light energy - No battery change required6-month power reserve once fully charged12-hour alarmChronograph measures up to 60 minutes in 1/5-second increments with split time measurement functionWhen the measurement reaches 60 minutes the stopwatch automatically stops countingDate CalendarHour, minute and small second handsLumiBrite hands and marketsScrewdown casebackCase diameter: 42.5mmStainless steel case and braceletWater-resistant to 10 bar, 100 meters (330 feet)