Sonically welded case ensures excellent water resistance. Previous 100 lap times are stored in memory and counts up or down from 20 hours in 1/100 second resolution. Large display simultaneously shows total elapsed time, split time, current lap time, lap counter and indicates low battery. A unique function is the stopwatch’s ability to calculate average strokes, beats, or pulses, per minute based on the timing of 3 sample strokes. Features a clock and a calendar. Button cell battery included. Dim.: 2.9"" x 3.25"" x 3/4"". Warranty 5 years.