FDS-SYS-R1X Board with 8 built-in relay packs is newly designed to work as a standalone module. The FDS-SYS-R1 is designed to allow you to directly trigger real aircraft parts or electronic components that require more "constant" power than The the SYS boards are designed to provide. Engine Start switches, Stick Shakers are examples where the FDS-SYS-R1X would be an ideal device. No Power Supply is required, USB connection and our super simple XML import capabilities make this the "go to" piece for integrating those tougher devices! Compatable with ProSim737.