StarTech.com 4-Port KM Switch with Mouse Roaming, USB 3.0 Keyboard/Mouse Switcher for 4 Computers, 3.5mm and USB Audio,

This Keyboard and Mouse (KM) Switch enables switching a single keyboard and mouse between multiple computers using mouse roaming, allowing users to seamlessly move the cursor across multiple screens (i.e., one monitor per computer). Mouse Roaming| Switch between computers by moving the mouse between monitors, without the need for hotkeys or physical buttons, enabling uninterrupted workflow and increased efficiency. Hotkey and push-button switching are universally compatible. Mouse Roaming is supported by most major desktop operating systems, including Windows, macOS, and Linux. Preset Monitor Layouts| To accommodate various physical monitor setups, there are six preset display configurations available. This allows for smooth mouse movement across host monitors. Thoughtful Design| Hotkeys enable listening to audio from one computer while controlling another. USB audio and 3.5mm pass-through are available, and LEDs provide visual port selection status, while an audible buzzer confirms hotkey selection. Note: On computers with multiple monitors connected, mouse/keyboard operation is limited to the primary display