USB 3.0 Bidirectional Switcher This USB switcher allows to share and switch one USB device between two computers or two USB devices to one computer. Examples of USB devices include printers, USB stereos, keyboards, card readers, removable hard disks, and more. With Power Supply InterfaceThis USB switcher provides a micro USB 5V 2A power supply interface, which allows you to use more stable and reliable when connecting high-power USB devices, such as hard disk drives, etc. Note: The kit only includes the USB charging cable, not the adapter.