What does a/s mean in a car?

[Polly]

The a/s in a car is a function of the car radio, which means automatic search and storage of radio frequencies. Here is some related information about car radios: Introduction to car radios: A car radio is a voice entertainment device installed in a car and is one of the earliest and most common configurations of in-car audio-visual entertainment systems. Introduction to radio buttons: POWER/VOL (left rotary knob): Press to turn on/off, rotate to adjust volume; TPK/MANU (right rotary knob): MP3 track selection and browsing; AST: Long press to automatically store radio stations; RPT: Repeat playback in CD/USB mode; INT: Browse and play in CD/USB mode; RDM: Random playback in CD/USB mode; AUX-IN-USB: USB player interface, standard 3.5mm audio interface; MEMU: Enter MP3 folder selection mode in CD/USB mode, use buttons 4-6 to navigate folders; SET: Sound effect adjustment; BND: Radio band selection.