peferct and easy for the 3rd monitor operation on OSX

Choose this application to use as a 3rd monitor (usually display finder) on OSX.
After comparison of people’s reviews and ratings of similar applications, Airport display got decent compatibility and preserve oroginal resolusion of primary and secondary monitors as well as reversibility.
a little bit of Dollor is needed, but works perfectly. It is so nice.

young cheol yun about Air Display®