BOSS Chromatic Tuner Metronome with for AAA Battery and Reference Tone Function TU-30 & Built-in Microphone/Input Guitar/Bass/Acoustic Instruments,

Professional-quality tuner and versatile metronome functions are condensed into a compact design. It features chromatic, guitar, bass, and flat tuning modes. It features an AccuPitch function that signals the completion of tuning with a sound. The reference tone generation function allows you to tune while listening to a reference tone. A metronome function with a highly visible display and a variety of rhythm styles. Equipped with inputs compatible with electric guitars/basses and various other instruments. The built-in microphone allows for tuning of various acoustic instruments. It is powered by two AAA batteries, which are readily available anywhere.