Very good keyboard with soft hits, the backlighting is becoming more essential, now I systematically adopted on all my computers. The wireless with a Unifying receiver is very limited but when you have several PCs, it is necessary to use a type of KONIG USB switch for example. I do not see the interest to connect multiple mouse and keyboards to the same receiver. Bluetooth would have been better as the K810 as more convenient to switch on different PCs but its disadvantage is the absence of keypad from where the acquisition of the K800. Battery life seems very good to me, still not recharged after 20 to use, yet I get the intensity of the lighting delay rétroéclairage.Une available software without have a nice feature because the duration of it is a bit short .