A:AnswerThe Model 325 mouse actually has 5 "buttons." The tilting scroll wheel has additional "clicks" if you tile the wheel left or right (which explains the white arrows next to the scroll wheel), or push straight down. Those clicks are all programmable using Logitech's downloadable software. Logitech offers some lower--priced models that don't have the tilting scroll wheel, and other models that have 5 physical buttons.
