I like the action of the key and button . the mouse and keyboard have battery install . the kit work right out of the box , with no configuration issue . plug and play . I give four star instead of five because the mouse , while very good , have only two button and scroll wheel . more button for other function would be nice , but for price , it work just fine for my need . the mouse glide smoothly on my laminated desk surface with no mouse pad under it . keyboard action be quiet . the extra function button be a good addition . keyboard be very light . this combo unit replace another Logitech wireless combo that finally `` retire '' long after the warranty expire . : -rrb-