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Set of Two Pcs Bosch FC4 Horn High Performance FC4 Replacement Horn. Automotive horns did not exist till almost a hundred years ago. In 1919 Bosch developed the buzzer system, which produced a continuous and uniform tone. This tone, however, made it difficult for other road users to estimate the direction or proximity of the vehicle. Bosch later introduced the harmonic diaphragm which enables other road users to better determine the position of the warning signal. Later technological advancements led to more warning device technologies and types, such as compressed-air and electro-pneumatic fanfare horns.
Click this link to check horn sound:- https://youtu.be/SE3TfcV3b_0