The Extron SW4 USB PLUS is a versatile peripheral sharing switch designed to allow a single USB device, such as a keyboard, mouse, touchscreen, audio interface, or webcam, to be shared among up to four host computers. It is particularly useful in environments like presentation suites, control rooms, lecture halls, and collaborative workstations where multiple source devices (e.g., a laptop, desktop, and media player) need to alternately access common peripherals without the need for physically unplugging and re-plugging cables. The switch prioritizes operational simplicity, featuring front-panel push buttons for manual selection of the active host computer, which provides reliable and instant switching.

Engineered for stability in professional AV installations, the device supports the full USB 2.0 specification with a data transfer rate of up to 480 Mbps, ensuring compatibility with a wide range of peripherals, including those requiring higher bandwidth like video capture devices. It includes a dedicated USB port for the shared peripheral and four separate upstream ports for connection to the host computers. A key feature is its ability to maintain persistent connections, which helps prevent the host computers from re-enumerating the peripheral device during a switch, thereby reducing the risk of software crashes or the need for peripheral drivers to reload, which is critical for seamless presentations or continuous operation.

The unit is housed in a compact, durable desktop enclosure designed for easy access on a tabletop or in a small equipment rack using an optional rack shelf. It can be powered via its included external power supply or, in many cases, directly from the USB bus of the connected host computer, offering flexibility in deployment. By eliminating the clutter and wear associated with constant cable swapping, the SW4 USB PLUS enhances system reliability, streamines user workflow, and provides a neat, integrated solution for managing shared USB resources in technology-enhanced spaces.