The RSIO-F6 includes a small RSIO circuit board with a DB-9 Female RS-232 Connector and a 6″ (152mm) flexible ribbon cable. The RSIO-F6 also includes a 2.1mm center positive power supply connector. The RSIO-F6 is used with a few of our Legacy series relay controllers to make it easier to connect RS-232 and power to the controller. Compatible with the R25, R210, and many other controllers.