Korg GA-1 (Tuner, Gitar, Bass, Jarum, 7 String, Portable, Mini, LCD) Features: Ultra-compact LCD needle-style dedicated Guitar and Bass Tuner High-precision LCD needle-type meter for stable tuning. Bass Mode: As a bass tuner, the GA-1 offer support for 5 and 6 string basses. Guitar Mode: As a guitar tuner, the GA-1 offer support for 7 string guitars. Quinta Flat Tuning mode lets you tune 1--5 semitones flat. Sound Out can produce a reference tone from the internal speaker. Auto Power Off function conserves battery life. Approximately 100 hours of continuous use. Don'''t let the price fool you! The affordable GA-1 Guitar Tuner / Bass Tuner is an excellent choice for any guitarist or bass player. The handy Tilt-Slit design provides easy viewing; Auto Power Off preserves battery life. Ultra-compact LCD needle-style dedicated Guitar and Bass Tuner High accuracy and superb functionality have made Korg guitar and bass tuners the worldwide favorite. The GA-1 is the latest addition to our best-selling GA series of tuners. With even more features, like a pitch reference tone and quinta-flat tuning, the GA-1 Guitar Tuner packs basic functionality and convenient tuning functions into an ultra-compact body. An easy-to-use dedicated Guitar and Bass Tuner This dedicated guitar and bass tuner lets you select either Guitar mode or Bass mode for truly easy operation with automatic pitch detection. The GA-1 Guitar Tuner mode supports 7-string guitars (7B through 1E). The GA-1 Bass Tuner mode support 6-string basses (Low-B, Hi-C). A high-sensitivity mic is built-in, allowing easy and accurate tuning of acoustic guitars. Sound Out - internal speaker provides a reference pitch In addition to visual tuning via meter, the GA-1 Guitar Tuner/Bass Tuner can play reference pitches from its internal speaker (Sound Out) for tuning by ear.