A deluxe version of the Matrix MR-500 metronome features an easy-to-use dial, including an LED pendulum motion with downbeat. Has a 40-215 BPM tempo range with six beats. The reference pitch ranges from A440 to 445 in 1HZ steps. with reference notes for tuning over a three octave range. Includes a personal earphone. Three-way switch for sound and light, only light, off. Folding stand, uses 9V battery (not included). About 2 21/64" x 3 31/32" x 1 7/32".