my brother tell I about the Logitech Wireless Combo mk550 and I order one and I be glad I do , it be truly the best keyboard and mouse I have ever use . it be comfortable , have a great feel and touch , be quite , and the programmable key be a add plus . my 10 year old grandson even comment on how much he like it . thanks Logitech for a great product and I highly recommend this item to anyone .