The Matrix MR500 Quartz Metronome is a vintage piece last used a year ago. No battery included. With a sleek black color and a compact design, it is suitable for use with various instruments such as the piano, cello, violin, ukulele, banjo, and viola. Its lightweight plastic construction and built-in back stand make it convenient for musicians to use while playing. Additionally, the metronome features a headphone jack for private practice sessions, making it a versatile tool for any musician looking to improve their timing and rhythm.