2-input 2-output mode allows two computers to share two USB devices. Wireless Bluetooth keyboards and mice are supported, but the dual-input, dual-output mode does not support the simultaneous use of two USB devices. Two computers share a printer, which eliminates the need for repeated plugging and unplugging when switching printing, effectively protecting native devices and reducing office costs. External controller, expanding external controller for easier switching and control. Circuit safety protection and printing are more reassuring, using printed circuit boards with embedded capacitors/resistors/diodes and other core components to provide overcurrent/reverse current/short circuit protection, making printing more reassuring. Instant file transfer for printing, USB 3.0 standard, theoretical transfer rate up to 500MB/S. File transfer to printer is as efficient as direct connection, making office work more efficient. Product Name: USB Printer Sharer Switching: button switching Input/output: two in two out Color: Black Material: ABS Package Contents: 1 * USB Printer Sharer 1 * Controller 2 * USB cable 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.