When using a wireless rodent with my Acer Aspire laptop, I sometimes have to
push the button on the USB end and the button on the bottom of the mouse and
back and forth like that two or three times before the mouse connects. One
wireless mouse I have is pretty finicky about batteries. It won't work on the
rechargeable types supplying 1.3 volts. It works OK on old-style carbon-zinc
cells which put out nearly 1.6 volts when new. With those, off brands work OK.