Electronic Digital Metronome with Timer Universal Electronic Metronome with 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 bottom and more functions. It s a reliable practice partner for lovers who play guitar piano drum guzheng and more. Features: 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. 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. A reliable practice partner for lovers who play guitar piano violin drum guzheng and more. Wonderful gift choice. Note: 1. Please remove the batteries if you want to use USB cable to power it. 2. Size and color may be slightly different due to manual measurement and different conditions. Thanks for understanding. Specifications: Color: Black/ White/ Blue/ Purple (Optional) Material: Beat: 0 1 2 3 4 5 6 7 8 9 Tempo: 40-208 /minute Voice: Electronic Voice Human Voice Timer: 15min 30min 45min 60min Power Supply: 3 * AAA (not included) or Type-C USB Powered Item Size: 140 * 70 * 45mm / 5.51 * 2.76 * 1.77in Item Weight (without battery): 130g / 4.57oz Package Size: 14.5 * 8 * 5cm / 5.71 * 3.15 * 1.97in Package Weight: 175g / 6.17oz Package List: 1 * Electronic Metronome 1 * USB Cable (Type-C) 1 * User Manual (English)