The Aura™ is ONLY compatible with..

MacBook Air (13-inch Mid 2011)
(July, 2011)
Model ID: MacBookAir4,2
1.7GHz, 1.8GHz
 
MacBook Air (13-inch Late 2010)
(October, 2010)
Model ID: MacBookAir3,2
1.86GHz, 2.13GHz
 
MacBook Air (11-inch Mid 2011)
(July, 2011)
Model ID: MacBookAir4,1
1.6GHz, 1.8GHz
 
MacBook Air (11-inch Late 2010)
(October, 2010)
Model ID: MacBookAir3,1
1.4GHz, 1.6GHz