Range / end strength is not great. I used a USB extension cable to get zoom the transmitter closer to the keyboard / mouse, or higher setting. My PC is 1m on the floor next to my desk, and without this extension, I had to play stuttering / dropouts eg when and fast mouse movements. Stop is okay for the price, but I'd bet even relatively little.
Very annoying for me: The mouse wheel is not in one piece, but a plastic wheel covered with a rubber strip. After about a year, I started having problems when scrolling on websites and was at a loss to be noticed that the rubber dissolved slowly and so partially turned. So I turned the joyful rubber, but the actual wheel turned with not always.
As of early 2015: mouse wheel now without function because the rubber has completely dissolved. Currently only the keyboard and mouse in a different mode, but will soon also replace the keyboard.
Overall okay, but thanks to low transmission power and inferior mouse from me only 2 stars!
