If you happen to be unfortunate and lose your AIR mouse receiver like I do (which happens to render that piece of hardware entirely useless) and then purchase a replacement receiver from eBay, you will have to go to http://www.logitech.com/index.cfm/447/3516 and download the Logitech Connection Utility. The MX AIR mouse is not listed at the bottom but you can download the one for MX Revolution, I tried it and it works. Just follow the instructions there. Voila! The AIR mouse is alive again.