These keyboards turn the iPad Air 2 into a fit working system.
This is a unique keyboard case as it can be used to charge a smartphone. It is much like other keyboard cases with a reasonable keyboard for rapid typing. The phone charging feature sets it apart from the crowd.
Check out the ZDNet review of Kensington KeyFolio Thin X3.
This cover is the thinnest you'll find, and a wonderful keyboard. It attaches to the iPad via a magnetic hinge like a smart cover and detaches for use. The tablet is inserted into a slot behind the keys for typing.
Although it's not a case, the keyboard is outstanding and very portable. It can be used with iOS, Android, and Windows, making it a versatile solution. The iPad Air 2 fits in a slot behind the keys, in one of two viewing angles.
See why the Microsoft Universal Mobile Keyboard was rated best in class on ZDNet.