Wittner 813M Wooden Metronome w/Bell (Matte Walnut)The walnut, mat silk 813M Metronome from Wittner is a triangular shaped wind up metronome with a swinging pendulum to mark time. It can be used by musicians and students for applications such as sight reading, rehearsals, ensemble playing, and more. The 813M metronome features an audible click with a bell on the downbeat. It has a snap on cover and an adjustable weight on the pendulum. The range is selectable from 40 to 208 BPM (Beats Per Minute).