STARTECH.COM
StarTech.com 4-Port KM Switch with Mouse Roaming, USB 3.0 Keyboard/Mouse Switcher for 4 Computers, 3.5mm and USB Audio, TAA Compliant - Mouse Roaming allows users to instantly switch computers by moving the mouse between monitors without using hotkeys or physical buttons; 3x USB HID and 2x USB 5Gbps
P4A20132-KM-SWITCHReference priceA$734.79≈ US$516Quote