Logitech MX Ergo Wireless Bluetooth Trackball Mouse Customized Comfort 2048DPI 2.4GHz wireless 8 Buttons Rechargeable battery CUSTOMIZED COMFORT Finally a trackball you can truly call your own. A unique adjustable hinge allows you to choose the best angle between 0°and 20° for a more natural hand position and greater comfort. ADVANCED TRACKING AND PRECISION MODE BUTTON Change the speed and accuracy of your cursor for optimal control with a press of a button. PRECISION SCROLL WHEEL WITH TILT Get things done faster with quick access to shortcuts. The precision scroll wheel features horizontal scrolling and a convenient middle click. EFFORTLESS MULTI-COMPUTER WORKFLOW Connect and work on two devices at the same time and easily switch between them. Boost your cross-computer experience with Logitech FLOW™ technology. Copy and paste text, images and files between computers. LONG-LASTING AND FAST RECHARGEABLE BATTERY Battery holds power for up to 4 months on a full charge. One minute of charge gives up to a full day of use. TECHNICAL SPECIFICATIONS Sensor technology Logitech Advance Optical Tracking Nominal value : 380 dpi Minimal and maximal value : 512 dpi - 2048 dpi Number of buttons: 8 Wireless technology Advanced 2.4GHz wireless technology Operation distance About 10 m Battery Rechargeable Li-Po (500 mAh) battery Battery life Up to 4 months on a single full charge2 Buttons Durability (Left / Right) 10 million clicks