I still have one of those in working condition. It is a World Engines Las Vegas single stick. It uses a square 9volt Eveready dry cell battery that was made for portable radios. It is on wide band 72mhz frequency and is not supposed to be used since it will overlap the channels on each side of its frequency. Mine is yellow and white which is 72.096. I currently have it in working condition with the idea of using an FRSKY DIY module to convert it to 2.4. I have done this with a newer World Engines radio but I am not sure the circuitry of the older radio is compatible. I really liked the radio and used it until the newer 72 radios came out.
Larry