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Combining an analog needle with three response times Bright LED indicators and a backlit LCD the OT-120 provides an easy-to-use and easy-to-see tuner for any instrument. A self-contained stand adds extra visibility. A line input is provides as well as a built-in microphone. The Sound Out mode provides a reference tuning tone from C2-C7. Our new patent pending Sound Back mode provides a reference tone pitched at the note closest to the input signal and the difference is shown on the display. Power up to 100 hours is provided from 2 x AA batteries. A soft case is included.