Computer Accessory Sets features: 2x4 USB Switch 2 Port PCs Sharing 4 Devices for Printer Keyboard Mouse Monitor Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. Function Description1. A set of mouse and keyboard controls two devicesTwo computers can share electronic devices such as printer/keyboard/mouse/U disk, without the need to repeatedly insert and remove between two devices, freely switch office and improve work efficiency.2. Two computers share a printerIt is possible to realize the sharing of printers between two computer mainframes without plugging and unplugging the printer line, saving office costs.3. Copying files is easier? U disk / alliance copy files do not need to be plugged and unplugged, easy - very switch to transfer transmission to reduce the life of the U disk / hard port, improve storage utilization4. Backup computer interface? Standard USB backup power interface, which can be used to connect mobile hard disk power supply, and support power supply for mobile phones and other devices.5. Plug and play, free drive, free installation? No need to drive or install to achieve energy, convenient, efficient6. Compatible with more operating systemsPure hardware design, no need to install drivers, no need to set up, ready to use compatible operating system such as WIN7/8/10/VIST /Linux/Apple Mac7. Power failure memory function?? Built-in high-efficiency switching chip, power-free drive, fast switching chip with power-off function, automatically remember the last port after the host