Because of the large buttons it is possible to print blindly, without special training.
Many languages, the list of which will be expanded, the availability of standard and ergonomic layouts, dictionaries for fast entry of long words.
The Basic version of the keyboard has all the basic functionality for typing, available national layouts, input of numbers and symbols in the main layer, input of additional letters and symbols in other layers.
The Pro-version has full text navigation, work with the system clipboard, cancel and return text entry. In the settings app, you can try all of the paid features before you buy.