[USB shared hub] Two computers can be exchanged with one key. Convenient and efficient, 2 computers share 2/4 USB devices, plug and play. [2 USB input 2/4 USB output] USB devices such as keyboard, mouse, USB printer, scanner, curve plotter, multifunction printer and Bluetooth device can be used together with two computers, which saves money and time. [5V DC power port] Devices such as hard disks and digital cameras may need external power to run. When using high-power equipment, please make sure to use the standard 5V adapter for power supply. Switching mode: press the key note:Chargers with a voltage higher than 5 V output are not allowed, which may affect the product. Use step 1 to connect two USB switch input ports to your PC or laptop using USB A-A cables. 2. Connect an external USB device to the output port of the USB switch. 3. Press the switch button to select the input computer. 4. Start the switch through the micro-USB port to access external hard disks, digital cameras and other devices. Power adapter is not included. Function: Two computers share 4 USB devices Standard: USB2.0 Switch method: button Power supply: micro-USB 5V Color: black Material: ABS Package Contents: 1 x Switching Adapter 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.