So to return to the keypad, you just have to associate bluetooth forgetting to press the "enter" key immediately after typing a series of numbers that appear on the screen, and that the pavement is ready work, and since I have it, ie for many a month, I found that it works great, just that every time the computer often must wait a few seconds before it is operational, but once it is, it remains throughout the session!
I preferred one over another because it is the same height as the Apple bluetooth keyboard, and it is the same color (very little about) is the one that contrasts with the less the official keyboard let's say.
The only criticism I would make it at the finish, it does not affect aluminum, but plastic, and the keys are a little more noise and are not as white as the original, but slightly yellowish .
Overall it is a good buy and if it again I would buy.
For those who are struggling to get by at the facility, although very simple, just visit the largest video sharing site, and type it "How to install LMP Bluetooth Keypad "without quotes.