The Sabine STX-1100 Auto Tuner offers handsfree operation, 7-octave range, jacks for in-line use, built-in mic, fast note recognition, easy-to-read LEDs with flat/sharp indicators that blink more slowly as you approach pitch, and a special power management feature that makes batteries last longer. Can be instantly recalibrated for nonstandard tunings. Sabine includes a 2-year limited warranty with the STX-1100 Auto Tuner.