I was thinking of doing a quick prop & need some help guesstimating the size & parts of the Ambassadors Of Death 1 Way Communicator.

Can anyone get a picture of the Doctor oping the back showing the circuit board?

Anyone got a guess what the grill is. At first & thought it was a coiled wire flatten & laid as individual strips. Now I'm not sure.  

I have only the black & white version, can someone find me a colored screencap.