I buy the mouse\/keyboard to supplement my office laptop for two reason :  1 -rrb- for ergonomic reason , I want a wireless keyboard that fit into my desk 's small pull-out keyboard tray , while still allow room for a full-size mouse on the same tray . the keyboard fit perfectly . the keyboard be similar in size to a laptop keyboard , so do not buy it if you want a regular full-size desktop keyboard .  2 -rrb- the idea of a in-air mouse seem cool . ok , it be cool , but it be not easy to control smoothly . the only situation where I 'll use the in-air function be when I be give a presentation with my laptop screen be project onto a wall screen , and I need stand away from the laptop .  as someone who have suffer a previous repetitive stress injury related to computer usage , I find my hand hurt use this mouse within the first hour of use . in my opinion , the mouse be too narrow , cause I to unnaturally clench my hand around the mouse to grasp it . as such , I do not use the mouse . everyone be different . test this mouse at a store , if you can , before purchase .  my solution be to buy a separate Microsoft wireless mouse . yeah , that be right , I have separate usb antenna for my keyboard and mouse plug into my laptop . it be a shame about the Gyration mouse be narrow , because I think a in-air mouse would have good potential for people with certain disability . a crude measurement show perhaps a 3\/8ths of a inch difference in the width of the front end of the two mouse , but the contour of a wider mouse be important to I .