A metronome is a mechanical or electrical instrument that makes repeated clicking sounds at an adjustable pace, used for marking rhythm, esp. in practicing music.
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One common type of metronome is the mechanical metronome which uses an adjustable weight on the end of a pendulum (also known as a double-weighted pendulum) rod to control the tempo: The weight is slid up the pendulum rod to decrease tempo, or down to increase tempo. The pendulum swings back and forth in tempo, while a mechanism inside the metronome produce a clicking sound with each oscillation.
Most modern metronomes are electronic and use a quartz crystal to maintain accuracy, comparable to those used in wristwatches. The simplest electronic metronomes have a dial or buttons to control the tempo; some also produce tuning notes, usually around the range of A440 (440 hertz). Sophisticated metronomes can produce two or more distinct sounds. Tones can differ in pitch, volume, and/or timbre to demarcate downbeats from other beats, as well as compound and complex time signatures.
Many electronic musical keyboards have built-in metronome functions.
Source: Wikipedia
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