This Korg MA-30 Compact Digital Pocket Metronome Music Tuner in blue is a great tool for musicians. It has been tested and is in working condition. This metronome is suitable for piano, cello, violin, ukulele, and banjo. It is digital and compact, making it easy to use and carry around. The Korg MA-30 metronome features a variety of rhythms and beats to help you stay on track and keep time while playing. The plastic material and blue color make it both durable and stylish. This item is a must-have for musicians of all levels.