It is a 3-octave keyboard, designed to be used in iPad with landscape orientation.
Pressing the keys on the keyboard sends a MIDI note event corresponding to that note. Quite straightforward...
The bottom row represents a lower octave.
At the toolbar at the top, you can press one of the "Transpose" buttons to transpose.
You can shift the octave by pressing the buttons in the octaves section in the toolbar at the top.
At the bottom lies the "auto-chord" feature. When you put your finger on the buttons in the bottom, a chord will be pressed when you press the keys.
- Pitch bend