Finally got around to use it - the buttons work, but the mouse tracking was very shaky and slow and mostly unresponsive. Thought it may not have installed correctly and/or it needed new batteries. I got new batteries and went through the set-up again - no use. It is useless and not fit for purpose - although cheap, it is a massive waste of money as you will just have to buy a new one. Spoke with CCL and was told their was nothing they could do as the original packaging wasn't kept (I often get things out and throw the packaging away to avoid the mess) - not even a credit note if returned. Bought a new mouse from elsewhere.