Compact guitar and bass guitar tuner that plugs directly into the instrument jack for tuning anytime and anywhere. It features simple and portable design so it can be attached to the keychain or fit in the pocket, and LED flash light for on-stage illumination. Tuner provides 12-note equal temperament scale with detection range of B1, 41.2 Hz-B6, 1975.54 Hz for guitar, and B0, 20.6 Hz-B5, 987.77 Hz for bass. It also features the Flat Tuning mode that allows for tuning seven semitones below original pitch, and is suitable even for 7-string guitars and 6-strign basses. Tuner is powered by one CR2032 lithium battery (approx. 35 hours of life, included). Dimensions: 31 x 137 x 28 mm. Weight: 31 g. Red colour.