USB Switcher Sharing 4 Computers：The 4-port USB switcher supports controlling up to 4 computers, also supports 3 computers and 2 computers switching. Share 4 USB3.0 devices such as mouse keyboard, printer, scanner and USB sound card. Plug and play, one-click switching, no need to set up complicated sharing software. Switching Methods：the 4 port usb switch has 2 switching methods: push button switching and desktop controller switching, switching 4 computers with one click. It is recommended to use the desktop controller to switch, you can store the switcher and cables farther away from the desktop, the desktop is more clean and tidy. Packing List and Service：4 port USB switcher kit includes 1 x 4*4 USB switcher, 1 x 1.5M/4.9FT desktop controller, 4 x 1.2M/3.9FT USB-A&C 3.0 cables, 1 x 1 meter USB power cable and 1 user manual, no need to buy extra cables. We also provide 1 year warranty, please contact us if you have any questions or concerns. Note: USB adapter is not included. Gbps Data Transfer / Plug & Play： the 4 port usb switch has 4 USB 3.0 ports with data transfer rate up to 5Gbps and is backward compatible with USB 2.0, USB1.1; works with all operating systems. It can bring you a good sharing experience. Stable operation：the 4 port usb switcher has an external power supply design and comes with a 5V 2A USB charging cable, when connecting external hard disk and other high-power USB devices, please connect the external power supply as the computer USB port itself provides less current. Note: Adapter is not included. This USB switch enables 4 computers to share 4 standard USB devices, free switching, and can adapt to a variety of complex application environments. It is a reliable, high-performance and efficient way of USB switching. 1，4 computers share a set of USB devices Four computers can share printer/keyboard/mouse/U disk and other electronic devices, no need to repeatedly plug between four devices, free switching office, improve work efficiency. 2, 4 computers share the printer No need to plug and unplug the printer cable, you can realize four computer hosts to share the printer, cost savings. 3. Copy files more easily Copy files from USB flash disk without plugging and unplugging, easy to switch, reduce USB flash disk plugging and unplugging, increase the life of the port, and improve the storage utilization. 4. 2 kinds of switching methods are convenient KM-U404A and KM-U404B both support desktop controller and panel button control. 5. Plug and play, no driver, no installation No need to drive or install to realize the use of energy, convenient, fast and efficient. 6. Compatible with more operating systems