What does the dial by the driver's feet do?

[sfarris]

Listmates,

I have read the entire manual for my 2003 911 Cabriolet (thanks Loren for posting it) and I am baffled. There is a small double dial by the driver's right side floorwell. The outer dial has two positions, the inner, smaller one is an adjustable reostat sort of thing. And when i adjust the outer dial, five LEDs light up in the U shaped plastic around the steering wheel.

Any ideas, or is this some sort of aftermarket gizmo that i need to decode?

thanks.

[CJ_Boxster]

Maybe a aftermarket indiglo gauge light adjuster, any pictures of this control?

[sfarris]

Maybe a aftermarket indiglo gauge light adjuster, any pictures of this control?

Once i recognized that it wasn't a Porsche part, i looked under and around and behind. I pulled it out again. Looks like a radar unit- K40 or somesuch. Thanks for the thoughts!