I really want to like this keyboard\/mouse combo . the keyboard look slick and have many button that you can program so that you can get to a folder or a website or whatever at a click of a button . the mouse , although a little heavy and clunky be nice and responsive and also have a number of different button and feature . however , all these non-essential bell and whistle can not hide the fact that the product as a whole be a big let down . at random time , the keyboard either shut down or there be tremendous lag response between hit the key and get a response -lrb- I be talk 10-15 seconds ... or sometimes no response at all -rrb- . for gaming purpose , it be a huge frustration and disadvantage to have you keystroke fail to register during random unexplainable time . for business purpose , the constant intermittent lag be frustrating and disruptive to the think process as these shortcoming will inevitably draw youur attention and focus away from you actual work . I experience these problem right out of the box . I even install brand new battery into both the keyboard and mouse and the problem in responsiveness be noticeable almost immediately . I do some search on the web for a fix to the problem , and while other have complain about similar issue , I have not see a responsive solution from Logitech or the forum . thus , I have a keyboard that take away my enjoyment of game , frustrate my work product , and appear to have no easy fix solution . if I could rate this less than one star , I would . for I , this k350 Keyboard\/Mouse Combo product be junk . the experience have be a complete waste of my time and money and I suspect that even though I uninstall the keyboard software that come with the product , there be still some residue somewhere taint my computer .