This compact quartz metronome by Matrix measures 2" x 3" x 1" and weighs only 5 oz. It has a red light that flashes the beat, which can be used with or without the audible “ticking” beat. Its tempo selector dial quickly snaps into a set position between 40-208 beats per minute. It will also produce an A440 tone, helpful for tuning, and has an earphone jack (earphone included) for privacy. It works off a 9-volt battery (not included), has an ON/OFF switch, and a handy built-in folding stand to keep the metronome upright.