Scalze Mechanical Metronome for Musical Instruments NO BATTERIES NEEDED: Our mechanical metronome uses a winding mechanism for power to produce loud, regular, metrical beats with optional beat bell. Beat selection is: 0,2,3,4,6 EASE OF USE: Simply wind it up, select your desired beat and tempo and then set the pendulum in motion. Easily move the weight up and down the pendulum rod to adjust the speed. Tempo selection: 40-208 bpm CLASSIC: Traditional, pyramid style metronome with bell in black durable plastic casing with a transparent protection cover. WARRANTY: Warranty for defects in materials and manufacturing EFFECTIVE: Master rhythm skills and improve your sense of beat and tempo by practicing with our mechanical metronome. Clear, loud sound for use when practicing piano, violin, guitar, bass, drums and other musical instruments.