Description Multifunctional design, worked as Tuner & Metronome & Tone Generator. Suitable for chromatic, guitar, bass, violin and ukulele. 2 selectable pickup modes, built-in mic or pickup with clip. 3 indicator lights give distinct indication of different conditions. Features: Sound back and human voice counting functions. The bracket on the back can hold up the tuner. Tuning Accuracy Indicator: Sharp: The LCD backlit is orange, and the # red indicator will light Flat: The LCD backlit is orange, and the b red indicator will light In-tune: The LCD backlit is green, the green indicator will lignht and the tuner will make a sound with same frequency Specifications: Color: Black Functions: Tuner to metronome to tone generator Tuning items: Chromatic, guitar, bass, violin, ukulele A4 range: 430 to 450 Hz Flat tuning: b, bb Tuning range: A0(27.5 Hz) to C8(4186 Hz) Tuning accuracy: ± 1 cent Reference tone: C: 2 A to 6 A G: 6E 5A 4D 3G 2B 1E B: LB 4E 3A 2D 1G HC V: 4G 3D 2A 1E U: 4G 3C 2E 1A Sound tolerance: < 1 percent Tempo range: 30 to 250 bpm Beat: 0, 1, 2, 3, 4, 5, 6 Metronome tolerance: < 1 percent Power supply: 3 V (2*1.5 V AAA batteries) (not included) Item size: Approx. 9.5*6.5*1.3 cm or 3.7*2.6*0.5 inch Package weight: 108 g Package List: 1*3 in 1 Intonation Trainer 1*User Manual (English and Chinese)