Boss TU-3 Tuner Pedal w/4 FREE Cables Includes 4 Cables! 21-segment LED meter with brightness control Accu-Pitch Sign function provides visual verification when tuning is complete Chromatic and Guitar/Bass mode (tune by string number, with support for 7-string guitars and 6-string basses) Flat tuning is supported with Guitar Flat mode, which allows for drop tunings up to six semitones below standard pitch