this be my third mk320 wireless 2.4 Ghz keyboard\/mouse combo system -lrb- on ' 2 ' separate ` desktop ' computer system and ' 1 ' laptop computer -rrb- and I remain very impressed with its performance . please take note : I have have no difficulty use the mk320 on ` desktop ' system but keep this in mind -- on ` desktop ' system and especially if you have other usb device already present , it can take -lrb- at least initially -rrb- up to a full minute for Windows to set the thing up because Windows will internally search for a pathway for the usb ` receiver ' that you plug into a available usb port so as not to conflict with other usb device . once Windows do that , it become almost instantaneous . I mention this because some folk have report -lrb- on Amazon and other forum -rrb- that the mk320 will not work on desktop system but it most decidedly ` do ' work on desktop system but that first connection may , as I say , and you happen to have various usb plug-in , or quite possibly even if you do not , take up to a minute as Windows set it up internally and after that it be smooth sailing , as they say . I also like the idea that the mk320 system go into a sort of sleep mode if you forget to shut the device off and this handy electronic circuit within the keyboard and mouse save the battery ! in fact , I do not even bother to shut the device off and that ` sleep ' mode with any protracted non-use keep the battery -lrb- \*\* 2 AAA 's for the keyboard and 1 aa for the mouse -rrb- fresh . in effect , it sens system non usage and essentially shut itself down . it be quick too in term of the mouse when use same , no lag time like older ` wireless ' system use to do and here I credit the 2.4 Ghz technology for the better no-lag response speed . and best of all , it require no pesky driver ! the only requirement be that you have Windows xp or higher -lrb- Vista or Windows 7 -rrb- . so too , that chart describe the mk320 as compare to the higher price Logitech system be in error as the mk320 system ` do ' have a on\/off switch on both the mouse and the keyboard and , on the mouse , a battery life indicator although the keyboard do not have a battery life indicator . the keyboard have those two user set plastic tab for keyboard ` slant ' adjustment and I find this most helpful or , conversely , you can keep the two ` slant ' tab flat and hence have the keyboard lay perfectly flat . you call . I especially like the fact that the small usb plug-in receiver control ` both ' device -lrb- mouse and keyboard -rrb- and set the thing up be quite simple . one tip and to avoid a Windows message that it can not find a keyboard or mouse , start you system as you normally do with the old wire keyboard and wire mouse as usual , then , when Windows start , plug in the usb receiver for the mk320 , ` wait ' until Windows find the non conflicting pathway -lrb- which could take up to a minute depend on you system and what it have in its ` innards ' ! -rrb- , and when both mk320 device start to function , simply pull the cord of the wire original mouse and keyboard and the mk320 ` combo ' will take over . battery be include with the mk320 but make sure that those shipment `` pull here '' paper tab -lrb- to activate the already in place battery -rrb- be ` fully ' remove because if only part of it come out in you hand , a small piece of the paper tab may be block the battery contact but that you can not see under the battery cover . check that ! finally this , if you have more than one of these wireless system of the same manufacture , viz. , the Logitech mk320 , if other system which use the identical mk320 be too close then obviously mouse or keyboard usage can ` extend ' to the other system because , hey , it be a wireless system ! check the distance between machine if you use the identical wireless system for more than one computer system to avoid wireless overlap . Doc Tony