Review on 🖥️ 4-Port USB Switch Selector: AIMOS USB KVM Switcher for Sharing 4 Computers and 4 USB Devices with One-Button Swapping - Ideal for Mouse, Keyboard, Printer, Scanner (Includes 4 USB Cables) by Fred Meeks

First I tried a box that was supposed to share 4 HDMI ports and USB, but USB only worked on the first 2 channels. This set top box only uses USB but works great. As another reviewer pointed out, the LEDs are difficult to see unless you're looking directly into the hole. Place a narrow strip of tape over the holes for the LEDs. The LED is projected onto the tape. For video I have 3 PCs all with DP video outputs. I installed a DP to HDMI adapter on the first PC. I connected the DP cable to the second PC. I connected a DP-mDP cable to a third PC. I use the monitor to select the input for the desired PC. I labeled the USB switch buttons as PC Alpha, Bravo, and Charlie. I renamed my PC to Windows 10. Problem solved.