Logitech Logi Wireless Trackball Laser Track Cordless Mouse M570 Mac & Windows 5099206025462 | eBay
Logitech M570 Review - RTINGS.com
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