The extra hardware that comes with a Check Secure Device is a 6' serial cable and a power supply.  The power supply plugs into the back of the Check-Secure unit and should be plugged into a surge protector.  The serial cable plugs into the "Printer" port on the back of the Check-Secure device and the other end plugs into the back of the printer.  After completed, insert the Check-Secure Card and you should receive a font page.