Electronic Digital Metronome with Timer Universal Electronic Metronome with Volume and Beat Speed Control, Battery or USB Cable Powered, for Guitar Piano Violin Drum The electronic metronome features digital display, beat speed control, control, battery or USB powered, non-slip bottom and more functions. It's a reliable practice partner for lovers who play guitar, piano, drum, guzheng and more. Electronic Digital Metronome with Timer Universal Electronic Metronome with Volume and Beat Speed Control, Battery or USB Cable Powered, for Guitar Piano Violin Drum: The electronic metronome provides beat type (0 to 9), beat speed control (40-208 /min), electronic and human voice, timer (15/ 30/ 45/ 60min).Digital display for easy reading, clear at a glance. 3 AAA batteries (not included) or Type-C USB cable powered, more humanized.A reliable practice partner for lovers who play guitar, piano, violin, drum, guzheng and more. Wonderful gift choice.Easy to use via the control buttons and a large turntable; compact and lightweight, convenient to carry.With earphone jack for silent use, not disturbing others; supports adjustment through the thumbwheel. Note: 1. Please remove the batteries if you want to use USB cable to it. 2. Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Black/ White/ Light Blue/ Light Purple (Optional) Tempo: 40-208 /minute Package Weight: 175g / 6.17oz Package Size: 14.5 * 8 * 5cm / 5.71 * 3.15 * 1.97in Voice: Electronic Voice, Human Voice Supply: 3 * AAA (not included) or Type-C USB Powered Item Weight (without battery): 130g / 4.57oz Item Size: 140 * 70 * 45mm / 5.51 * 2.76 * 1.77in Material: Timer: 15min, 30min, 45min, 60min Beat: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Package List: 1 * User Manual (English) 1 * USB Cable (Type-C) 1 * Electronic Metronome With earphone jack for silent use, not disturbing others; supports volume adjustment through the thumbwheel. A reliable practice partner for music lovers who play guitar, piano, violin, drum, guzheng and more. Wonderful gift choice. The electronic metronome provides beat type (0 to 9), beat speed control (40-208 compatible with beats/min), electronic and human voice, timer (15/ 30/ 45/ 60min). Digital display for easy reading, clear at a glance. 3 AAA batteries (not included) or Type-C USB cable powered, more humanized. Easy to use via the control buttons and a large turntable; compact and lightweight, convenient to carry.