System is comprised of four flame effect units (propane accumulators), two wireless receivers, and a joystick transmitter. Xbees are configured for pin mirroring (DIO), so the transmitter is really nothing more than an xbee, two double a's, and a joystick. Giant balls of fire are delivered to the location of your choice arcade style. Receivers are a couple of Seth Hardy's business cards, suitably modified for four channel operation. KiCad and Schematics available at his site: http://propaneandelectrons.com/projects/bcard-xbee