Logitech's most advanced trackball for trackball enthusiasts and consumers searching for alternatives to mice and touchpads. Delivers 20% less muscular strain compared to a regular mouse. MX ERGO features a unique adjustable hinge for personalized comfort and the latest tracking, scrolling and power management technology. Logitech FLOW™ enables effortless cross computer control. WARRANTY 12 Month Return to Base Warranty FEATURES USB Wireless Full Size Mouse 512-2048dpi Optical Trackball Black with Grey Ball Adjustable Angle Built-In Li-Po Battery Up to 4 Months on a Single Charge SPECIFICATIONS Wireless Range Approx. 10m Interface Unifying USB Wireless Receiver Bluetooth Battery Rechargeable Li-Po (500 mAh) Battery Sensor Logitech Advance Optical Tracking OS Support Windows 7, 8, 10 Mac OS X 10.12 or Later Dimensions (mm) 51.4 (w) x 99.8 (d) x 132.5 (h) Weight Approx. 259g (With Metal Plate)