1、4 IN 4 OUT: 4 port USB switch selector allows one button switching between 4 computers to share 4 USB peripherals without the need to constantly pull cables or set up complex network sharing software. It is perfect for sharing printers or scanners in small office environments. 2、MULTI DEVICE SHARING: USB KVM switch allows you to share multiple devices such as printers, scanners, mice, keyboards, card readers, flash drives and other USB devices between 4 computers. Note: When connecting high power USB devices such as HDDs, digital video cameras, etc., a 5V power supply needs to be plugged in (power adapter not included). 3、INCREASE EFFICIENCY: 4 port USB switch selector enables work to avoid complicated and troublesome cable changes and other operations, providing one button switching. Simple and compact, it saves desktop space and makes your desktop more neat and tidy. 4、EASY SWITCHING: You can easily switch between 4 computers with the push of a button or wired remote control. The included wired remote control allows you to say goodbye to messy cables on your desk and switch more easily. Indicator lights make it easy to know which computer is in control. 5、GOOD COMPATIBILITY: USB switch selector, driver free and plug and play. Compatible with for Windows 10 8 8.1 7 Vista XP and for OS X, for Linux and for Chrome OS.