- N ▁rad ios . ▁This ▁allowed ▁full ▁ 8 0 2 . 1 1 ▁D raft - N ▁ 2 x 2 ▁communication ▁in ▁both ▁ 8 0 2 . 1 1 ▁D raft - N ▁bands ▁at ▁the ▁same ▁time . ▁▁ 4 th ▁generation ▁On ▁October ▁ 2 0 , ▁ 2 0 0 9 , ▁Apple ▁un ve iled ▁an ▁updated ▁Air Port ▁Ext reme ▁with ▁anten na ▁improvements . ▁▁ 5 th ▁generation ▁On ▁June ▁ 2 1 , ▁ 2 0 1 1 , ▁Apple ▁un ve iled ▁an ▁updated ▁Air Port ▁Ext reme , ▁referred ▁to ▁as ▁Air Port ▁Ext reme ▁ 8 0 2 . 1 1 n ▁( 5 th ▁Generation ). ▁ ▁The ▁detailed ▁table ▁of ▁output ▁power ▁comparison ▁between ▁the ▁ 4 th ▁generation ▁model ▁MC 3 4 0 LL / A ▁and ▁the ▁ 5 th ▁generation ▁model ▁MD 0 3 1 LL / A ▁can ▁be ▁seen ▁below : ▁ ▁{ | ▁class =" wik itable " ▁border =" 1 " ▁style =" text - align : center " ▁| - ▁! ▁ ▁Fre quency ▁range ▁( M Hz ) ▁! ▁ ▁Mode ▁! ▁ ▁Air Port ▁Ext reme ▁model ▁! ▁ ▁Output ▁power ▁( d B m ) ▁! ▁ ▁Output ▁power ▁( m W ) ▁! ▁ ▁Com parison ▁( per c ents ) ▁! ▁ ▁D ifference ▁( per c ents ) ▁| - ▁| ▁ ▁row span =" 6 " | ▁ 2 4 1 2