It was necessary that I try key combinations pile to find the right features; those that provide access to the red characters and special keys (equivalent digital pad and other function).
So do not look for the "del" because it is the "FN" key that allows switching characters and locking via another button.
After a week of testing, I could not get used to it, I am often forced to operate key combinations to successfully write as with a "normal" keyboard.
Furthermore, the finish is so silent promised, it is very far below the comfort and silence of my keyboard "Cherry" current.
The cord is a bit short, forced to put a USB extension cable.
Morality, impossible to condense all the functions of a "standard" keyboard in a compact mini keyboard; must make a choice, or a large keypad or constantly juggle with key combinations, so I keep my "beloved Cherry".