Verbatim Ergo Wireless Desktop Optical Mouse, Blue 97593 Unique Design: Modern, easy-grip design with convenient thumb support Nano receiver: small enough to plug in once and leave connected Wireless: Plug in nano receiver and go wireless; 2.4GHz reliability and performance Ergonomic: Smooth, rubberized grip designed for comfort and control All Verbatim mice are backed with a 1-Year Limited Warranty and a 40-year history of quality and reliability. Available in three colors; black, red and blue