The AMT-550B is an integrated tuner, metronome & tone generator in one handy unit. The tuner is designed for chromatic instruments, guitar, bass, ukulele & violin. It features a wide LCD Screen with 3 LED light tuning indicators. It has a detection range of A0(27.5Hz) - C8(4186.00Hz) and features two tuning modes : metre mode (Auto) and sound mode (Manual). The tuner has a pitch range of 430Hz - 450Hz - with an accuracy of ±0.5 cent. It also features in/out 1/4" jack sockets for tuning in noisy environments, and an internal microphone for quieter situations. A piezo pickup is included. The metronome has a tempo range from 30 - 260bpm. The metronome can pulse in various rhythms, and time signatures easily. It features a 1/8" mini headphone jack, for quiet practice, and a handy volume control. The AMT-550B is powered by 2 AAA batteries.