Features: - Save the current parameters every time you shut down. - Five minutes without operation, the machine automatically shut down. - The unique sound back intonation training function is a good helper for you to train intonation. - Dual color LED display with backlight, clear display, better visual effect for your better performance. Specifications: Moods: Chromatic, Guitar, Bass, Violin, Ukulele A4 range: 430-450 Hz Flat tuning: b, bb Tuning range: A0 (27.5 Hz) -C8 (4186 Hz) Tuning accuracy: 1 cent Reference Pitch: C: 2A G: 6E 5A 4D 3G 2B 1E B: LB 4E 3A 2D 1G HC V: 4G 3D 2A 1E U: 4G 3C 2E 1A Noise tolerance: 1 percent Tempo range: 30-250 bpm Beat: 0, 1, 2, 3, 4, 5, 6 Metronome tolerance: 1 percent Size: Approx. Size: 98mm x 64mm x 15mm Power supply: 3V (2 x 1.5V AAA batteries) (not included) Package List: 1 x Digital Tuner 1 Pair x Earphones 1 x User Manual Notes: 1. Manual measuring, please allow 1 - 3mm error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.