What does 'CH' in the car mean?

[StEmily]

CH on the car steering wheel is an abbreviation for 'change', meaning to switch. CH+ and CH- are used for playing CDs or FM radio to go to the previous track or previous frequency. To switch frequencies, you must first search and save the radio frequencies on the six band buttons before switching. MODE is used to switch playback modes, meaning it is the button to toggle between CD, FM, and AUX. This is commonly found on multi-function steering wheels. More details are as follows: 1. A multi-function steering wheel refers to the placement of some function buttons on either side or below the steering wheel, including audio controls, air conditioning adjustments, car phone functions, etc. Some also have the cruise control button set on the steering wheel. 2. The advantage of a multi-function steering wheel is that the driver can directly operate many of the car's electronic devices from the steering wheel without having to search for various buttons on the central console, allowing for more focused attention on the road ahead and greatly improving driving safety.