Korg MA30 Ultra Compact Digital Metronome Highly visual liquid crystal pendulum 13 different rhythms are built-in so you can practice to more than a click track Rhythms include duplets, triplets, triplets with inner beats omitted, quadruplets, and quadruplets with inner beats omitted Twelve reference pitches C4 -B4 for you to tune to Adjustable calibration (438-445 Hz)