RCS (original) under construction Transmitter had 2 headers, B and CB header sets microprocessor to "posichange"C header sets center off characteristic Simple fm modulated one way remote controlThere were 4 frequencies sold originally, and when the long range transmitters came out, only 3 were legally usableyellow -green -red -blue - receivers were made by Elsema, Tony made the motor driver,you could reverse at speed initially MT-8 / elite ver 6.2 microprocessor - with socketed microprocessor - made by PIC3 triggers out for soundfront headlightrear headlightmotor elite