Do not think about buying a cordless mouse unless you want to take the chance of lag, it's really stupid I know FPS people who say they use cordless mice. I bought a cordless logitech mosue and keyboard, in windows - the keyboard couldn't even keep up with my typing! In games, I could feel the slight jumpy 10-15 ms lag, it couldn't keep up with my typing in games either (obviously). It's not good for gamers or people who need quick reactions (ala think/type quick). I'm still on an old best buy mouse pad, and ms wheel mouse (for 4 years, never cleaned) running ps2rate for silky smooth movement...i tried optical and it's too hard to rocket jump and it loses touch if you pick it up very lightly off the ground - the idea is novel but the functionality cannot beat a normal ps2 corded mouse.