Review on 🔁 Enhanced 4 Port KVM Switch HDMI Dual Monitor Extended Display - 4K@30Hz, 2 USB 2.0 Hub, Wireless Keyboard & Mouse - Hotkey Switch Supported - 4 in 2 Out - Powered by USB by Frank Villanueva

I don't like leaving bad reviews. However, this product was delivered on July 11th and since August 13th, Monitor B has stopped working and I cannot exchange or refund it. I posted a question in the questions section and it was answered. So I'm assuming the seller has tested and isn't interested that their product doesn't even last 30 days of use. While the product worked, it did all the jobs and tasks it was designed to do, but unfortunately, the ability to use KVM with a second monitor turned off takes away from the purpose and reason for the purchase. I do not expect a refund, I will replace a defective device. I can confirm it works on Mac, Windows and Linux. My next step was to set up my Rasberry Pi on it, but the second monitor didn't work. My testing included powering the unit on for 24 hours, replacing all attached dhmi cables, and replacing the monitor connectors. Any monitor connected to port B of monitor will not show up if you move monitor B to port A if that monitor is (only) running. If it wasn't for that I would definitely say this is a 5 star product. Bearded and angry.