logitech m570 wireless trackball mouse (Works) Needs 1 AA Battery not included | eBay
Best Ergonomic Mouse? Logitech M570 Review - YouTube
Amazon.com: Logitech M570 Wireless Trackball Mouse – Ergonomic Design with Sculpted Right-Hand Shape, Compatible with Apple Mac / Microsoft, USB Unifying Receiver, Dark Gray (Discontinued by Manufacturer) : Electronics