This system is supplied by, Clancy Arnold from the USA, it consists of two modules one for the model and the other to be fitted in the handle with a 10K varible resistor to control the motor speed. Clancy can supply up to 7 channels if required, both lines should be insulated, power to the handle module is by a PP9 battery and the model module is powered from the BEC output if using electronic speed controllers, I have fitted this system to my B17 and it works very well.