Wireless mouse operated by using a trackball. Buttons can be programmed to do whatever actions you'd like. The mouse can connect through either Bluetooth or a USB receiver.
Used but in good condition, was really helpful when I was having nerve issues with my hands.
Learn more about the mouse here: https://www.kensington.com/p/products/electronic-control-solutions/trackball-products/expert-mouse-wireless-trackball-1/
$25 or best offer--trying to get rid of this before I move on Sunday.
In your email, please let me know a few times you can come by to pick this up. Located near the Parkside Q train station.