The SB-344 is a switch box which allows computer-sharing on devices that allows two or four users to share one peripheral or one user to share two or four peripherals. Based on the manual switching principle it's as easy as selecting the required letter your device is on. The SB-344 is a perfect solution for a small office environment where a peripheral can be shared between four users without the trouble of a network. There is no interface card or software to configure. Installation is as easy as connecting cables between the Switch and your computers.   Specification: Supports 9 Pin Serial. Manual Selection. Operating system independent transparent to all applications. Power-free operation. No Software required.