Features: This is two in one: tuner & metronome. Digital Tuner is more accurate, very sensitive and wide range. It has tuner, metronome and TAP tempo metronome functions. Can rotates 360 degrees for easy view. It can stand the unit on a flat surface or clip this unit on a flat surface or instruments, so it supports MIC and CLIP tuning modes. Powered by one CR2032 button battery (NOT INCLUDE). Tuning for Chromatic, Guitar, Bass, Violin and Ukulele. Specifications: Tempo: 30-250 bpm Tap Tempo: 30-250 bpm A4 Frequency: 410-450Hz Tuning Range: 0A(27.5Hz)-8C(4186.01Hz) Tolerance: +/-1 cent Tuning Modes: MIC, CLIP Package size: 8.2 * 5.7 * 3.5cm / 3.2 * 2.2 * 1.4in Package weight: 45g / 1.59oz Package List: 1 * Clip-on Tuner 1 * User Manual (English & Chinese)