This compact and lightweight clip-on tuner is ideal for acoustic instruments. Featuring a fully adjustable head and an LED back-light which turns from orange to green when the note is in tune.Power supply: 3Vdc (1 x CR2032 not supplied)vbCrLfWeight (without battery): 21.8gvbCrLfA4 frequency: 430-450HzvbCrLfTuning modes: Chromatic, Guitar, Bass, Violin, Ukulele and WindvbCrLfTuning range: A0 - C8vbCrLfKey choice: C, F, Bb, EbvbCrLfDimensions: 20 x 53 x 40mm