Timer counts down from 99 minutes, 59 seconds in second increments with 3-button ease and big-digit visibility. Automatic memory resets the display to the last programmed time - ideal for repetitive tests. Quartz-crystal accuracy is 0.01%. Three-quarter-inch-high digits are readable from 20 feet. Alarm sounds for 30 seconds. Size is 2.5" x 2.5" x 0.5". Weight is 2oz. Supplied with 2-year AAA battery, magnet, stand, and clip.