What kind of remote control system is used in this, I wonder?

I watched this video just now and I am quite surprised. ----------------------------------- http://www.youtube.com/watch?v=on4DRTUvst0 ----------------------------------- To me, this new delivery system looks so cool and I want to make that kind of robot someday. It's a quite surprising fact that you can... show more I watched this video just now and I am quite surprised.
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http://www.youtube.com/watch?v=on4DRTUvst0
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To me, this new delivery system looks so cool and I want to make that kind of robot someday.
It's a quite surprising fact that you can control the robot in such a long distance, so I begin to wonder what kind of remote control system was used for that robot. I want to control my one at least 5~10km from where I am so I guess I need to study a high-end technology...?
Please borrow your wisdom for a bit everyone!
Correct me if I have a wrong idea!
Update: And If possible, I want to know about the power source too... thank you in advance!
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