Logitech ERGO M575 Wireless Trackball Mouse - Easy thumb control, precision and smooth tracking, ergonomic comfort design, for Windows, PC and Mac with Bluetooth and USB capabilities - Off White Ergonomic comfort design, relaxed hand and arm: The comfortable, sculpted ergonomic shape of this mouse naturally fits your hand Smooth thumb control: Track precisely with great cursor control on any surface and easy thumb-operated trackball and adjust the cursor speed with Logitech Options software Optimal for tight workspaces: Because the trackball doesn't move, it’s excellent for tight workspaces and busy desks and fits in seamlessly alongside your computer and keyboard or laptop Two ways to connect and multi-OS: Connect simply with Bluetooth or the USB receiver and never worry about drop-offs or lag up to a 10m (33 ft) range Plastic parts in ERGO M575 include post consumer recycled plastic (Graphite/Black: 50%, Off-White: 21%). Uses FSC-certified paper for responsible packaging. Up to 24 months of use from a single AA battery with the USB receiver; you may even forget your Logitech wireless trackball uses batteries at all Convenient controls: Moving between documents or browsing your favorite websites is a breeze with the ergonomic mouse's large, easy-reach back and forward buttons and the precision scroll wheel