Logitech M570 Wireless Trackball - Laser, 2.4GHz, Up to 33ft, USB Wireless Receiver, Programmable button, Scrolling wheel - 910-001799 at TigerDirect.com
This Trackball Mouse Has an 18-Month Battery Life
Logitech M570 Wireless Trackball Mouse Review: Unconventional Features
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
Logitech M570 Review - RTINGS.com
My Review of Logitech M570 Wireless Trackball - Can It Replace your Mouse?
Logitech M570 Wireless Trackball Mouse Review: Unconventional Features
Logitech M570 Wireless Trackball Mouse Gets 54% Reduction to $27.50, Today Only - TechEBlog
Logitech adds Unifying Receiver to the new Wireless Trackball M570 - CNET
Refurbished: Logitech Recertified 910-001799 M570 Black 5-button 1-wheel USB RF Wireless Laser Trackball - Newegg.com