ERGONOMIC DESIGN - A 3-button device which can be control simply by moving 3 fingers for cursor control and screen navigation; Dimension: 3.94 x 6.61 x 1.18 inches (10 x 16.8 x 3 cm) TRACKBALL COMFORT - A durable 0.98 inch (25 mm) diameter trackball with optical tracking technology to provide precise cursor control; 800 DPI SOFT GEL WRIST REST - Features cushion gel pad to place your wrist comfortably for long daily use LESS HAND AND WRIST MOVEMENTS - Stationary tracking which reduces hand and forearm movements and design to help users with RSI or carpel tunnel syndrome SYSTEM REQUIREMENTS - Windows 7, 8, 10, USB port;   Package includes: 1 x PERIPRO-706 and manual