Waste of money!!!!
Bought it to try and mirror my mac with Apple TV. In theory in worked but its so slow displaying to my ipad its unusable. It costs $20 for the app on your mac but they dont tell you you need to download the app for your iPad as well, which costs $10. Then I ran into an issue where my macs login screen would only display in 1024X768. After looking into found out that others had experienced the same issue and fixed it by uninstalling Air Dsplay. Dont buy it, I want my money back.
Smythe67 about Air Display®, v1.5.2