The Korg DT-7 Tuner has a large, easy-to-read LED meter, super-accurate tuning in all modes, a built-in buffer amp to eliminate "loading" effects normally found when playing through a tuner, a "sound out" mode for silent tuning that is remotely switchable (from a footswitch), especially bright LEDs, and a built-in microphone. The DT-7 tunes both in a normal mode or in the Buzz Feiten mode for guitars, a patented tuning that adjusts or tempers the standard tuning slightly to set up in the Feiten system. Korg tuners and metronomes purchased from a Korg USA authorized dealer now have a three year warranty.