32-BIT PROCESSOR FOR FAST RESPONSE FEATURING A SLIM, LIGHTWEIGHT DESIGN. TRUE-BYPASS WIRING WITH FULL-COLOR VERTICAL DISPLAY. TRUE-BYPASS WIRING WITH FULL-COLOR VERTICAL DISPLAY. REFERENCE PITCH: A4 = 440 HZ / CALIBRATION RANGE: 415 - 475 HZ. POWER REQUIREMENTS: 9V BATTERY OR 9VDC (300MA) POWER SUPPLY. CURRENT DRAW: 27MA – 56MA / TUNER WITH NO INPUT SIGNAL: 40MA.