StarTech.com USB 3.0 to Dual HDMI Display Adapter / 1x 4K30Hz & 1x 1080p / USB Type-A Connection / Windows Only USB32HD2 I only checked if the monitor displayed an image. It worked properly. I am selling this because I purchased a docking station and no longer need it. I believe there are no operational issues, but I cannot accept returns. There are no noticeable scratches. Once you increase the number of monitors... You can't go back to life without dual monitors, can you? This item is sold on Amazon for 8500 yen. I purchased it for 12800 yen... Price not negotiable. Instant purchase welcome.