First of all: The first delivered HDMI Switch buzzed very loudly. The humming was clearly audible in the room. Thereupon I contacted CSL Computer. I can say the service was great !!! I was sent to a new switch within 4 days! This works fine with no hum! The image reverts quickly. Without distorting or the like. Without power supply cable is eliminated. Great! For me the switch as it should work. For the price 5 Stars.