No body mentioning any microsoft keyboard and mice. Their Keyboards and mice are the only thing microsoft have got right. I have the Desktop Elite wireless and my bro got the executive. The executive is exactly the same as the elite appart from the mouse got some leather on it. the exec cost about £52 from www.simply.com when we got it and had free postage. The batteries have lasted for about 4 and a half months and not dead yet. The mouse powers down when not in use. The keyboard batteries ran out after 3 months. I use it like every day to so battery life is good. recharables gone in now then supplied batteries died