A:Answer None, sort of
It comes with 2 rechargeables
AA
I keep it plugged in and charged, but you can just charge as needed,
Since keyboards donr move the wire, to me, is not an issue as it is with mouse
There are 3 lights to tell you how charged it is,
an on/off switch, only needed when on batteries
The level of light is adjustable
The keyboard is silent
Overall, I can't think of anything to change other.than having a portable version with no number pad