Also on the opposite left side of the belt is an identical box with a Gold painted band on top. I believe this was the microfiche reader data storage device seen used in the movie. One more idea later borrowed by Gene Roddenberry in the form of the tricorder.
And another view of the tool belt. this communicator is filled with very different items. Also note that the back of the comm box are black with a silver area on the top front window. There is also a second smaller black box next to the main comm and microfiche units, not sure what that’s supposed to be?
And one more shot.