See also:

REV indicator light (STI)
This light illuminates when the engine speed reaches a level set by driver or when the tachometer needle enters the red zone. ...

Engine
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PTY (Program type) group tuning (only FM reception)
Press the “PTY/CAT” button to change to the PTY selection mode. At this time, the PTY group that you are currently listening to will be displayed for 10 seconds. In PTY selection mode, “PTY SEL” ...