everything about this keyboard and mouse combination be great . it be really easy to install . all i have to do be take out the plastic that activate the battery and plug in the usb and it install itself . within a minute it be work and i be go . reception be great . the sleep function on it work great . it be impossible to detect that the keyboard and\/or mouse be sleep prior to begin to use it . the laser mouse be very accurate and the build in palm rest be convenient and comfortable . also , the keyboard be power by two double a battery and the mouse by one aa battery . these be just normal one not expensive one , so potential buyer should be happy that $ 2 battery will power you purchase for another year or two . I would definitely buy this again -lrb- for other computer -rrb- .