I have the skookum Robotics sk720 system With Gps1. And buss with cables. This is the complete system coming off of a working helicopter. If you know what the system is then you know how adjustable and programmable that it is. This was their top-of-the-line system. It has been on my helicopter for seven years in storage and I got the helicopter out and flew it a couple of days ago. I plugged the unit up to check the programming before I flew and it connected and everything worked as it should.