Large control buttons and very light weight (1.1 oz.) make this stopwatch very comfortable to use. Counts up to 24 hours with 1/100 second readout, and also has a split interval function. Alarm clock works in either 12 or 24 hour format. Calendar displays date and day of the week, and there is also an hourly chime option. A beep makes it clear that contact has been made when any button is depressed. Measures 27/8" x 2 3/16" x 3/4". Button cell battery included.