https://www.startech.com/en-ie/kvm-switches-accessories/p4a20132-km-switch
4-Port KM Switch with Mouse Switching, USB Switch for Keyboard/Mouse, 3.5mm/USB Audio, Peripheral...
4-Port KM Switch with Mouse Switching, USB Switch for Keyboard/Mouse, 3.5mm/USB Audio, Peripheral Sharing for 4 Computers, TAA Compliant
4 port km switch