You just use the pendulum swing to choose your needed beat and tempo and let the pendulum go into motion. And provide a loud sound to aid you in keeping track of beats and tempo when practicing with various musical instruments. It features a pendulum in the center that completes this classical look that all musicians love. Applicable for practicing piano violin guitar bass drum and other musical instruments. The pendulum can make up 40 to 208 beats per minute and the beat selection is 0 2 3 4 6. It has a tempo tolerance of 1% and a beat by wood block chip sound with a 5 position on/off the bell. It is a wind-up spring mechanism that gives the metronome the power it needs to create power to produce regular metrical beats. This is economical and built to last without the required need to spend money on batteries to power it. Learning music with the help of a mechanical metronome allows learners to accurately master rhythm and rhythmic emphasis (accents) which is an important tool for learning music to build a strong foundation develop rhythm maintain tempo play accurately and improve learning efficiency and musical awareness.