Seiko ST-777 Auto-Chromatic Tuner with Sound Mode (Black) Chromatic tuner features C2-B6 pitch reference notes, with a wide auto-tuning range (A0-C8). Select Chromatic Tuner, Guitar Tuner, or Bass Tuner and Auto, Manual, or Sounding tuning mode. Adjustable calibration (410Hz-450Hz); built-in microphone and in/out jacks. Features a large LCD indicator; Auto Power-Off after 10 minutes; and memory backup function. Includes 2 AAA batteries and a detachable metal stand bar.