Performance Plus ENOTEMAX Electronic Clip-on Chromatic Guitar Tuner, Metronome and Tone Generator Guitar, Bass, Violin, and Chromatic Modes-Metronome-Tone Generator Large LCD screen changes color from red to green when in tune 360 degree rotating display Tone Generator- Built in electronic pitch pipe built in 0-9 beat type Tempo 30 - 250 Beats Per Minute