this be the best wireless keyboard ever . I love that it be wireless but be rechargeable and fully function if connect via usb -lrb- unlike traditional battery -rrb- . it be attractive and I love the Logitech Unifying receiver -lrb- I also have the the Performance Revolution MX mouse -rrb- . the backlighting be great and the way it sens you finger before you start typing be very cool -lrb- you can turn this off -rrb- . I feel like it save a lot of power by sense motion for the backlighting and I leave it on always . it be also very easy to turn it on\/off the light or adjust the brightness from the keyboard . get it .