on a fresh set of battery , this keyboard be barely able to transmit a signal 2 meter , with clear line-of-sight to the antenna . it be pathetic ; at this range , one in ten keystroke just do not go through . it do not help that it use the same 2.4 GHz band as the WiFi , so the keyboard stop work any time there be a active download , and the wifus stop work any time you type . physically and ergonomically , it be great . the side make very good handle , and the trackball and mouse button be well-positioned . the built-in trackball be nice when it work -lrb- same reception problem , plus it do not track fast motion very well -rrb- . overall , however , the reception and interference problem make this a poor design .