See also:

Deactivating HDC
Press the button again and the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...

BMW 7 Series Owners Manual
h4 {color:#800000} h3 {color:#0033CC} h2 {color:#008000} h1 {color:#FF0000} ...

Controls
Controls 1 Display screen 2 Infrared interface for headphones 3 CD/DVD player 4 Headphone connection: jack plug 5 12 V sockets ...