What's the device on the wrist of a bomb suit?

On the right wrist of a bomb suit, there is a small device akin to a PDA attached. What is this device? The device is clearly present on the right wrist of the man in this picture: a href="http://en.wikipedia.org/wiki/File:Aviano_bomb_suit.jpg" rel="nofollow"http://en.wikipedia.org/wiki/File:Aviano…/a