This is a fully functional English keyboard which types the letters upside-down i.e. horizontally flipped.
The purpose of the keyboard is to use it for the messaging with the people who type in translit, i.e. to make harder for them to read your messages.
The intention of the keyboard is to force a discipline in messaging communication means.
NOTE : Unicode standard doesn't support all flipped characters, therefore some characters are chosen with the most visual similarity.