Features:Digital Tuner is more accurate， very sensitive and wide range.Can rotates 360 degrees for easy view.It clip this unit on a flat surface or instruments.Powered by one CR2032 button battery (NOT INCLUDE).Tuning for Chromatic， Guitar， Bass， Violin， Ukulele C and Ukulele D. Specifications:Color: Black Mode: JT-01A4 Frequency: 440HzTuning Range: 0A(27.5Hz)-8C(4186.01Hz)Tolerance: +/-1 centPackage size: 4 * 3.5 * 5.3cm / 1.6 * 1.4 * 2.1inPackage weight: 30g / 1.03oz