Features: Professional mini digital metronome, universal for all instruments that need beat or tempo, easy to use. Clear LCD display and indicator light, with "select" & "up" or "down" adjuster for Rhythm Types, Tempo, Beat & . 0~9 beat, multiple rhythm, 30 to 280bpm tempo. Built-in TAP function enables you to test your ideal tempo & tempo of a melody. With 3.5mm stereo earphone jack, powered by 1 * 2032 cell battery(not included). Clip & lanyard hole design for convenient carry and easy to fix. Specifications: Material: Color: Black Earphone Jack Dimension: 3.5mm Tempo : 30~280 Bpm Beat: 0~9 Accuracy: +-0.001 Power Supply: 1 * 3V(2032) Battery(Not Included) Item Size: 5.5 * 3.3 * 2cm / 2.2 * 1.3 * 0.8in Item Weight: 18g / 0.6oz Package Size: 12 * 8 * 3cm / 4.7 * 3.2 * 1.2in Package Weight: 27g / 1oz Package List: 1 * Metronome 1 * User's Manual(Chinese / English) Note: The guitar is not included. The battery is not included.