A
Yes.
B
-- do that remotely?
A
Yeah. Do it remotely just looking at the, what they do, they do several different types of things. Sometimes they put a source light and they look at the source light and then as the car goes by, you can see the exhaust pipe and the source light behind it and you can look at the emissions actually.
B
Huh.
A
And ...
B
Now where does the source light go?