T-Rex Engineering TUNEMASTER Chromatic Guitar Tuning Pedal Features a Vivid LED Display as well as True or Buffered Bypass Modes with Gain Control for Using as a Line Driver (10095) Ultra-simple to use chromatic tuner with selectable true or buffered bypass options Large display with red/green LED lights designed to clearly see regardless of lighting or distance Clear in-tune indication when display lights up in green Displays the name of the note and indicates whether the note is flat (left side arrows) or sharp (right side arrows) Dot in upper left corner indicates the note is raised one semitone (G#, D#, A#, etc.)