This unique stopwatch allows the timing of a subject without disturbing it since the alarm is audible only through a headphone. With two simultaneous 0.01 second displays. Counts up or down to 10 hours. In stopwatch mode shows current lap time and cumulative total. Memory stores last 8 lap times. In timer mode displays original setting and counts down. Warning alarm sounds at 30 seconds before time elapses and when time has elapsed. The alarm can be set for repetitive intervals of every 0.25 seconds to every hour. Countdown cycles repeat upon completion. Also features lap counter. Size is 3.5” x 2.25” x 3/4”.