“Up to the Twentieth Century, reality was everything humans could touch, smell, see, and hear. Since the initial publication of the chart of the electromagnetic spectrum, humans have learned that what they can touch, smell, see, and hear is less than one-millionth of reality.” -Bucky Fuller
The square button second from the bottom mutes the audio. I’ve taken to carrying a marker in my car and writing “<— MUTE” next to them. Alternatively, a small screwdriver between the speaker grating.