A:Answer I have three activated screens using this adaptor. In addition to my laptop, I use the HDMI input for a large monitor and a USB input for my WACOM pen screen. I've never tried it with two extra monitors. I was surprised to learn that when I switch the lines around, the computer screen shows up on the pen tablet. My guess is that you'll need an adapter with two HDMI input slots rather than just one, but I am not sure.