They use a system similar to Tamiya's infrared combat system but alot cheaper ( $69 for the old type controller ) and not quite as sophisticated.
http://www.vstank.com/vspro/spec_ir.html
but it should be fun running the modern tanks around while our Tamiya's recharge. Pzrwest, your not all that far from us if you'd like to join us sometime to watch or use a spare IR combat tank