Korg GA-40 Large Display Guitar and Bass Tuner: * Wide detection range supports 7-string guitar (7B through 1E) in Guitar mode, and 6-string bass (Low-B, Hi-C) in Bass mode * Indicates pitch quickly and accurately * Built-in high-sensitivity mic allows easy and accurate tuning of acoustic guitars * Sound Out function produces a reference tone from the internal speaker * Features Quinta flat tuning  supports the lowered tunings used in heavy metal styles, detects dropped tunings of one through five semitones and supports even super-long scale guitars that extend below the pitch range of conventional guitars * Output jack (bypass) makes it easy to check the tuning even while you"re performing * The stand on the back lets you place the tuner on any surface * Auto power off function turns unit off after 20 minutes without use * Approximately 85 hours of continuous use