The C5010 Timer Stopwatch from AST is an easy to set and use table top timer. It is ideal for rally event timing or even service timing thanks to its extra large 25mm digits. It features:Timer: The timer is easy to set, counts down to zero, then counts up. It features an audible alarm with a maximum countdown time of 23 hours, 59 minutes and 59 seconds. There are 4 modes of count up that are selectable, and in the count up mode cumulative split times can be taken: 1 Second increments to 23 hours, 59 minutes and 59 seconds 1/100th second to 59 minutes, 59.99 seconds 1/100th second to 9999.99 seconds (decimal second) 1/100th minute to 1999.99 minutes (decimal minute)Clock/Alarm: The clock can display the time of day in either 12 or 24 hour mode, the alarm function displays the daily alarm time only.1 year manufacturer s warranty.