I love the idea of having the rechargeable battery on the mouse. On my last wireless combo, I probably spent more on batteries then I did on the keyboard and mouse. Logitech has this feature on a few of there mice. The keyboard isn't as bad on power consumption. I've had this keyboard for a few months now and I haven't had to change the batteries. The mouse I throw on the charger every day. The mouse you get is probably worth $30-40. The keyboard almost seems to be a freebie. Looks great too. Thanks Logitech!