This is a Canon ten-key calculator with a trackball. This unique calculator can be used as a ten-key, trackball, and mouse by connecting the USB cable on the back of the unit to a computer. I intended to use it as a spare when I lost my mouse at work, but I'm not used to trackballs and couldn't use it at all, so I'm putting it up for sale. It worked fine on my computer (Windows 11), but the trackball feels cheap. The calculator function works without any problems. You can switch between the ten-key and calculator modes with the PC/Calc button. There is no instruction manual. Please check the photos for details as there are fine scratches and dirt on the exterior.