Andoer Aroma AMT-560 Electric Tuner & Metronome Built-in Mic with Pickup Cable 6.3mm for Guitar Chromatic Bass Violin Ukulele Universal Portable Worked as Tuner & Metronome, good helper for novice. Two ways to pick up signal, with built-in mic or pickup cable. Super bright backlight, LCD display(5.2 * 2.6cm), it can provide excellent visibility. With a holder on back, it is easy to stand on the flat. Auto power off function, the device will turn off automatically if there is no signal present or operation in 3mins. The guitar showed on the picture in not included.Powered by 2 * AAA batteries (NOT INCLUDED).