6 programmable buttons give users more versatility Side pointer speed buttons allow convenient adjustment without ever changing your grip on the mouse - up to 4 speeds Design is more comfortable & carefully sculpted for uncompromised comfort Larger flange for your pinky to rest and relax on while mousing Updated internal software technology comes standard Illuminated features turn off to indicate when the mouse is in sleep mode Gaming grade infrared sensor tracks more accurately on more surfaces than a laser sensor Variable resolution, from 800-2600 dpi, can be changed easily by moving a switch on the side of the mouse Optical scroll with detents (clicks) Small lip on lower edge keeps your little finger off the mouse surface New electrical design and internal mechanical design for improved fit, feel and reliability
