Stompbox-style guitar tuner pedal 21-segment LED meter with brightness control High-brightness mode enhances meter visibility outdoors 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 6 semitones below standard pitch Tuner automatically mutes when the tuner is on Can supply power for up to 7 BOSS compact effect pedals