Two PC share one Serial device including printer & barcode reader, or one PC connects to two serial devices. This video switch has built-in 5-Pin DIN connector with Keyboard Reset for sharing devices like AT Keyboard or MIDI but usage is optional. It has gold-plated contacts with metal case, fully-wired for maximum application compatibility and heavy duty sealed rotary switch to prevent dust and moisture that is guaranteed up to 10,000 switching cycles. This premium manual switch has SureGrip with suction to provide stability during switching, and 5 Year Warranty. (Connectors: 3 Din5 Female/3 DB9 Female)