Touch/Type/Power Covers (Future- Cover) these are attachable keyboards with a proprietary connector for the Microsoft Surface series of tablet computers.
Touch Cover is a family of keyboards for the Surface that focus on interaction through the touch keyboard. When typing through this keyboard (provided that you do not have silent mode enabled), the PC makes sounds, which helps you navigate when typing.
Type Cover uses the already traditional scheme of user interaction through physical keys. switches are made according to the "scissors" type, typing is pleasant, space and shift stabilization is present.
The Power Cover is a Type Cover 2 cover with an extra battery. It is stated that it will be able to charge the battery "up to 70 percent". The internal battery capacity of the keyboard is unknown.
Here is a universal pinout of all Keyboard covers for Surface that work with Surface RT/RT2/Pro/Pro2