The GT-4 is a dedicated guitar/bass tuner that automatically detects an instruments pitch which offers simple operation. With a large note name display in the center and red LEDs that rotate in a circular pattern, it is a revolutionary tuner with superb visibility. It supports seven-string guitars (7B through 1E) in Guitar mode, and six-string basses (Low-B and Hi-C) in Bass mode. While compact, it instantly indicates the pitch with the high precision you expect from Korg. The built-in high-sensitivity mic supports tuning of acoustic guitars as well.

Features:
Tuning: 12-note equal temperament
Detection Range: B1 (23.13 Hz) to B6 (1975.54 Hz)
Auto Tuning Modes: Strobe Mode; Mirror Mode; Meter Mode
Flat Tuning Function: 1 to 5 semitones (semitone steps)
Detection Accuracy: Better than ±1 cent
Connections: INPUT (1/4")
Power Supply: Two AAA batteries (3V)
Battery Life: Approximately 18 hours (when tuner is operating with alkaline batteries, Strobe mode
on, and A4 continuous input)
Dimensions: 2.40" (W) x 2.56" (D) x 0.87" (H)
Weight: 2.36 oz. (including batteries)