Korg KDM-2 True Tone Advanced Digital Metronome Dynamic metronome with 30-252 tempo range, 19 beat patterns, 3 PCM sounds, and Tap Tempo control Korg's original cylindrical resonator provides powerful sound and improved tone; Headphone output Top-mounted Start/Stop switch doubles as visual indicator; red & green LEDs mark beats and downbeats Provides reference tuning pitch (C4-B4); A4 Calibration from 410 to 480 Hz. Large LCD screen; efficient power for long battery life - 120 continuous hours at 120 BPM