dear AMT-560 Electric Tuner & Metronome Built-in Mic with Pickup Cable 6.3mm for Guitar Chromatic Bass Violin Ukulele Universal Portable Features: Worked as Tuner & Metronome good helper for novice. Small and exquisite appearance it is convenient to carry. Two ways to pick 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 flat. Powered by 2 * AAA batteries (NOT INCLUDED). Auto power off function device will turn off automatically if there is no signal present or operation in 3mins. It can be used for tuning of guitar chromatic bass violin and ukulele. Specifications: Tuning mode: Chromatic guitar bass violin ukulele : 430-450Hz Tempo : ±0.5% Tempo : 30-260bpm Beat: 0 1 2 3 4 5 6 7 8 9 Rhythm: 9 types Tuning mode: Mic Pickup cable Power: 2 * AAA batteries (not included) Display size: Approx.5.2 * 2.6cm / 2 * 1in Product weight: 65g / 2.3oz Package size: 13 * 8 * 2.2cm / 5.12 * 3.15 * 0.87in Package weight: 113g / 3.99oz Note: guitar showed on picture in not included. Package List: 1 * Electronic Tuner 1 * Pickup