Ergonomic sculpted design - unique adjustable hinge allows you to customize the trackball angle from 0 to 20 degrees for a more natural, comfortable hand position, and reduced muscle strain Cross-computer control?- game-changing capacity to navigate seamlessly on two computers, and copy-paste text, images, and files from one to the other using Logitech flow Dual connectivity?- use with up to three Windows or Mac computers via included Unifying receiver or Bluetooth smart wireless technology Rechargeable battery?- up to 70 days of power on a single charge; Nominal value : 380 dpi Precision scroll-wheel - tilt and middle click wheel allows for precise scrolling and other Convenient controls such as horizontal scrolling