Logitech MX ERGO Wireless Trackball !! Logitech MX ERGO*

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 rechargable battery - up to 70 days of power on a single charge; number of buttons: 8 precision scroll-wheel - tilt and middle click wheel allows for precise scrolling and other convenient controls such as horizontal scrolling