D9 Female 4-1/1-4 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 m more→anual 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