I recently got a European (UK) verison of this RF keyboard/mouse combo and I am a bit unimpressed. Maybe someone else with one can tell me if my unit is faulty or if it is bad by design. The US version appears to have 8 RF channels (around 49MHz) and most of the rest of the world gets 4 channels (around 40MHz). The documentation says the receiver will work on 2 channels simultaneously allowing simultaneous operation of two devices. Mine does not. I can't make the mouse and keyboard both work unless they are set to the same channel. Set to the same channel they can't be used simultaneously, for example you can't move the mouse while holding down the shift key, I can't shift or control click anything. Can anyone else with a 4 channel version move the mouse while holding down the shift key?