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A horn is a sound-making device installed on motor vehicles, trains, boats, and other types of vehicles. The sound it makes usually resembles a “honk” (older vehicles) or a “beep” (modern vehicles). The driver uses the horn to warn others of the vehicle's presence or approach, or to call attention to some hazard.
An air horn is a pneumatic device designed to create an extremely loud noise for signaling purposes. It usually consists of a source which produces compressed air, which passes into a horn through a reed or diaphragm. The stream of air causes the reed or diaphragm to vibrate, creating sound waves, then the horn amplifies the sound making it louder.
Modern pickup trucks usually have one or more white cargo lights that illuminate the bed of the truck, often controlled in conjunction with the interior dome lighting. Most gauges and controls on a dashboard in modern vehicles are illuminated when the headlights are turned on, and the intensity of light can be adjusted by the driver for comfort.
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Most of the CarPlay software runs on the connected iPhone, and the CarPlay interface provides the audio and display connection to the car's infotainment system. CarPlay adapts to various display sizes and control interfaces for each vehicle: touch screen, rotary dials, buttons, steering-wheel controls, and hands-free microphones.
A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element(s). A common form (right) consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air.
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