Review on 🔀 UGREEN USB Switch Selector KVM Switch - Share 4 USB Devices among 2 Computers, USB 2.0 Peripheral Switcher Box Hub for Mouse, Keyboard, Scanner, Printer - with One-Button Swapping and 2 Pack USB A to A Cable by Antoine Collins

This product was made by madmen. Instead of putting two USB-B ports on the back for input, they used USB-A. Not only does this mean you can achieve the opposite, it also means you can't use regular cables. To add insult to injury, the included cords are only 3 feet long. For those curious, the SGM7227 USB 2.0 DPDT high-speed analog switch is used here. The switching logic and LED lighting are controlled by an unnamed microcontroller, and the USB hub is a high-speed 4-port FE1.1s USB 2.0 hub controller. The hub controller has an input that you can use to report bus or standalone power. This input remains floating, but was measured at 4V, so it's likely listed as standalone. If you don't have an external power supply connected, it can cause overcurrent for the upstream ports. The USB upstream ports have diodes on the power rail to prevent computer backup power, but the secondary micro-USB port does not. , so be aware that this port may be powered again. It looks like there might be a fuse preventing too much current on the 4 terminals, but there's no marking on that part, it might just be a filter. The circuit board is a two layer design and the USB pairs are unlikely to meet the impedance requirements specified by the standard. If you're having trouble, the connector farthest from the LEDs has the shortest traces.