Yes Jen, wireless is battery. You have a receiver that goes in the USB socket and the unit itself is cable free. The cable on the receiver of the cordless trackball I had was as long as the lead is on the wired trackball I use now. I didn't see the point of it because of that. It might as well have been connected. You sound as good with keyboards as I am with vacuum cleaners. I'm always breaking them and I don't even do that much housework.