Soft rubber coating, offers excellent hand feel. Scroll wheel made of silica gel, is precise and feels comfortable. Specially designed finger slots, supports fingers well. Its ergonomic shape eliminates forearm twisting and offers better relaxation of fingers. Opposing thumb slot to finger slots naturally counteracts the finger pressure, so that the mouse does not move sideways when clicking with normal force. High definition optical mouse. 2.4GHz wireless transmission. ¾ in Nano receiver, 30 ft range. Adjustable tracking resolution: 400/800/1600 DPI. System requirements: Windows 7, 8, 10 et 11, Linux, & Mac. 4 ¾ x 2 ¾ x 2 ¾ in.