Usage Tips:USB Sharing Switch for 2 Computers sharing 4 USB Ports, KVM Switches for PCs with One-Button Swapping and 2 Pack USB Cable [USB Sharing Hub]One button swapping between 2 computers. Convenient & efficient, 2 computers share 4 USB devices, plug and play. [2 USB Input 4 USB Output]Keyboard, mouse,USB printer, scanner, curve plotter, multifunction printer, Bluetooth equipment and other USB devices can be used with 2 computers which saves money and time. [5V DC Power Supply Port ]Devices like HDD and Digital Video Cameras might need external power to running. Please make sure use Standard 5V Adapter for powering while using high power device. [Great Compatibility]Plug and play for Windows 10/8.1/7/Vista/XP and Mac OS X, Linux and Chrome OS. Note: Any charger with higher voltage than 5 V output is NOT allowed and may affect the product Using Steps: 1, Connect both the USB Switcher Input Ports to your PC or laptop with the USB A to A Cables. 2, Connect your external USB devices to the USB Switcher output ports. 3, Press the switch button to select the input computer. 4, Power up the switch via the Micro-USB port to access devices such as External HDD, Digital Video Cameras and more. Power adapter is not included. Colour:As Shown Material:plastic Package Contents: 1 x USB KVM Switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.