The gc1  controller is made by penny and giles technology. It has been discontinued. We have a limited amount of these units for sale. When theyre gone they are gone.  They are used on earlier pride jazzy select models, and have since been replaced with the gc2 module, as well used on jazzy select models. They are not interchangeable due to one has a 3 pin plug on the cord (GC1). The GC2 has a 4 pin plug at the end of the cord.