MX ERGO, an ergonomic trackball mouse. I'm selling it because I recently upgraded to the new MX ERGO S. There are some scratches on the surface of the mouse, but it's not sticky, and it works perfectly. The included items are the box, receiver, and everything shown in the photos. - Model Name: MX ERGO (MXTB1s) - Brand: logicool - Included Items: USB receiver - Features: Trackball, built-in rechargeable lithium-ion battery, charges via Micro USB adapter - Design: Ergonomic design Thank you for looking.