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. The GA-1’s Quinta Flat Tuning mode supports the lowered tunings used in heavy metal styles to give more weight to the sound. Until now, dedicated guitar tuners have supported a maximum of only four semitones below standard pitch, but the GA-1 gives you five steps of flatted tuning, extending as far as five semitones below standard pitch, and supporting even super-long scale guitars that are five frets longer than conventional guitars. Low-power consumption design allows an amazing 100 hours (approximate) of continuous battery life (A4 continuous input, Meter mode, zinc-carbon batteries). * Even if the pitch is within the detection range, detection may not be possible for instrumental sounds that contain a large number of overtones or have a rapid decay. If you leave the unit powered-on for 20 minutes without performing any operation, the Auto Power Off function will turn the power off automatically, avoiding unnecessary battery consumption.