Info from Manufacturer:

Solo Metronome The standard in compact metronomes The MA-1 Highlights Multi-function compact metronome. Beat-Counting display makes it easier to practice your rhythm and phrasing Choose from two types of tempo steps: pendulum steps or full steps Tap Tempo function lets you quickly set the desired tempo Beat display offers from 1 to 9 beats, plus 8 rhythm types to practice any style of music Tune any instrument using the 12 step (C4 ? B4) chromatic reference pitch Adjustable calibration setting (410 ? 480 Hz) Earphone jack with adjustable volume Memory backup function and auto power-off function Up to approximately 290 hours of continuous operation The MA-1 is a compact metronome that solidly covers all the basics with a broad tempo range and a rich variety of beats and rhythm patterns. The MA-1 also shows the beat in an innovative way that makes practicing easier. With stylish design and reliable functionality, this is an indispensible rhythm training aide for any musician.