No I have a cord on mine, no idea 'why'?.....but it works just fine, so I really don't care too much.
I have to save up for a new mouse, as I LOVE The one in my pic...hard to find these days.
You can place your hand on the red ball, and it is amazing!!!!
He now uses neither, because the computer doesn't work, since I wrote my last reply. He's emails started going through to his phone, so he asked our daughter to delete them. Their were 19,000 of them, I think he said, & they were all gone in a couple of seconds!