What does the AM button in the car mean?

[HenryLynn]

The AM button on the car refers to the radio band of the car radio. There are two modes for car radios, one is AM and the other is FM. Generally, when listening to the radio, drivers use the FM button more frequently because FM is used to operate the frequency modulation of the radio, while AM is used to adjust the radio band. The following is a related introduction about AM: Since AM uses the medium wave band, the frequency of the received signal is relatively low. Typically, the AM reception frequency in cars is around 1000KHZ, which results in smaller transmitted sound and less information, leading to poorer sound quality. In contrast, FM has a reception frequency of around 100MHZ, which is 100 times that of AM.