quartz metronome

Metronome that translates the electric signal produced by a piece of quartz into sound or visual signals.

sound signal

Device that translates the metronome’s electric signal into beeps; its volume can be controlled.

standard A

Reference note established as the international standard; its frequency is 440 Hz (440 vibrations per second).

light signal

Part that translates the electronic beats of the metronome into flashing light.