Model A :  Screen display equal or less thatn 4.5 inches ( Iphone 4/4S/5....)

Model B : Screen display  4.8 inches-5.5 inches ( Samsung Galaxy S III/S IV/Note II....)

Model HK-I/HK-II/HK-III/HK-IV:  Screen display equal or less thatn 4.3 inches ( Iphone 4/4S/5....)