After the complaints made against the MK700 model (inserted in the section of MK 710) and against the Logitech MX5500 model, due to the deletion of the signs on the keys of the keyboard, K800 model also purchased through Amazon must also make the The purpose of our criticism for another reason: after a few months of use, a key (the black plate that supports the letter O) has become detached from its support (white mechanism that ensures the dynamics of the key) without reason and without having been brutalized by the user (a rather quiet employee). A priori irreparable problem, despite our attempts. After years of trouble-free previous Logitech, the problem rate on newly purchased products seems abnormal. If more Logitech refuses to guarantee the products purchased through Amazon (see our comments under the MX5500), all these purchases are all wasted money. The favorite brand has fallen in our esteem and detestable policy SAV made it unpleasant to us.