Linkskey Prima 8-Port USB/PS2 KVM Switch 19-Inch Rackmount 1U with OSD and Daisy Chain (LKV-9308) USB and PS/2 Interface Support on both console and PC side up to 16 units using daisy-chain cable Daisy-chaining distance up to a total of 30 M Computer Selection using front-panel push buttons, keyboard hotkeys, and OSD Menu Password protection through OSD Menu