Electronic Digital Metronome with Timer Universal Electronic Metronome with Volume and Beat Speed black.The electronic metronome Features digital display, beat speed control, volume control, battery or USB powered, non-slip bottom and more functions. It s a reliable practice partner for music lovers who play guitar, piano, drum, guzheng and more. Features: The electronic metronome provides beat type (0 to 9), beat speed control (40-208 beats/min), electronic and human voice, timer (15/ 30/ 4