Features: Support a set of USB keyboard and mouse synchronization control four computers. You can choose synchronous mode and switch mode. Support hotkey switching. Built-in high-performance chip to help you better control computers, stable and high-speed. Aluminum alloy shell, anti-static, anti-corrosion and anti-interference. Good heat dissipation effect, effectively prolong the service life of the product. No driver required, easy to use, plug and play. The LED indicator lights show the real-time working status. Specification: Name: 4-port USB synchronizer Color: Black Material: Aluminum alloy Input interface: 4*USB-B Output interface: 2*USB-A Supported PC quantity: 4 Compatible systems: Windows/Linux/Unix/Android/DOS/Netware Function: Hotkey switch, mouse across the screen, independent control, synchronous control KVM function: Sharing keyboard and mouse Working temperature: -5-65 Working humidity: 5-90%RH (uncompressed) Item size: 10 * 6.4 * 1.8cm / 3.94 * 2.52 * 0.71in Packing list: 1 * Synchronizer 4 * USB Cable 1 * User Manual