Four PC share one VGA/SXGA monitor/projector or one PC connects to four video devices. This video switch has built-in 5-Pin DIN connector for sharing devices like AT Keyboard or MIDI but usage is optional. It has metal case, heavy duty sealed rotary switch to prevent dust & moisture, gold-plated contacts and 1 Year Warranty. (Connectors: 5 HD15/Din5 Female)