I did not mount this to the desk, but instead attached it to an arm of my monitor stand. I?m stuck with these on my trip, otherwise I would return them and get a 1/2 size smaller if possible. Also, they are true to size. Didnt fit but its a real nice shoe. Two of the buttons control volume, and the third (middle) button acts as a smart button. Very happy I purchased both the desk and cabinet from this company. It gives the perfect amount of protection to the pelvis without making too much bulk or pressing on your stomach. Material is strong and withheld travel. But I found the online user guide. Es para niño de hasta 12 años más o menos.