Four computers share 4 USB devices:4 Port USB sharing switch allows four USB peripherals devices to be shared between Four computers at the push of a button without constantly swapping cables or set up complicated network sharing software. Improve work efficiency. keyboard mouse usb switch:USB 2.0 sharing switch made of metal case, not easy to scratch! Small and lightweight size: 2.56 x 4 x 0.79 inches. No external power supply is required for the KM switch box. Support for wireless mice and mechanical keyboards. Ideal for Sharing Devices:Ideal for sharing devices such as printer, scanner, mouse, keyboard, card reader, flash drive and other USB devices between 4 computers. Widely use for office or family, monitoring room, financial operator or designer. This is a good sharer switch for data exchange and transmission. Great Compatibility, Driver-free:Supports 4 USB inputs and 4 USB HUB outputs. Support speed up to 480 Mbps; Backwards compatible with USB 2.0 / 1.1 devices.