wireless trigger

ever wonder how people can take a close up picture of president? i know if you are a big shot photographer or you are from the media you can get up close and personal.

but even you have the chance will you able to get the pic you want? lets say the picture like this:
i dont think you going to lying down on the ground and wait for the shot right? maybe you will.. but for some smart people, this is how they do it.
remote camera trigger that allow you to View from where you are and take the shot when they come in range. hehe..

this go out to all 5D mark II owner :P