The Cablemax USB to RS-232 Cat. 5 extender is a low cost hardware solution that will extend your RS-232 devices using a single standard Cat. 5 / 5e / 6 UTP cable. It provides full-duplex remote access and control of any RS-232 protocol device. The USB to RS-232 Cat. 5 extender kit consists of a local transmitter and remote receiver . It provides you with a tremendous amount of flexibility in your installation. You can place RS-232 devices in any location you want and control them remotely up to 90 meters ( 270ft ).