Fast transfer, even surprising! Finally except when it breaks down, I contacted Corsair who sent me an RMA number without which no return is accepted! Small problem it must return to its fee! If you go to the post, at the counter we require that you make a collisimo and therefore more than 13 per abroad! A small tube put it in a padded envelope and send it with the RMA number Corsair has provided you, putting it in a 'mailboxes simply 3 patch! It works very well! My key was replaced in 8 days with a return by TNT! So yes, the guarantee works, but we must seek the site, the page for returns and especially ........... Review your English!