Acoustic guitar tuner 1.Quality Hard metal 2.Steel spring 3.High quality silicone cushion 4.2-color screen backlight Popular online acoustic guitar tuner Tempo range: 40bpm-208bpmBeat: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9Rhythm:Power: AAA battery, 3 pieces / AC-DC Adaptor, 5VDemension: 64mm x 150mm x 28mmWeight: 125g Popular online acoustic guitar tuner