It's a transmitter, a radio for speaking to God.
Marion, don't look at it. Shut your eyes, Marion. Don't look at it, no matter what happens!
Belloq: Dr. Jones. Again we see there is nothing you can possess which I cannot take away. And you thought I'd given up.Belloq: You chose the wrong friends. This time it will cost you.Indiana: Too bad the Hovitos don't know you the way I do, Belloq.Belloq: Yes, too bad. You could warn them... if only you spoke Hovitos.
You can't do this to me, I'm an AMERICAN.