Trust-15861-PS-2-Optical-Mouse-MI-2275F-Trust-15861-A-comfortable-optical-mouse-with-a-PS-2-connection-that-is-suitable-for-all-computers-with-a-PS-2-port-The-mouse-has-three-buttons-&-a-scroll-wheel-&-features-an-advanced-optical-sensor-for-fast-response-&-high-accuracy-Trust-15861-PS-2-Optical-Mouse-MI-2225F-