Ergo M575 Wireless Trackball Mouse Design, 440dpi, 8 Buttons Total Black

Ergonomic comfort design, relaxed hand and arm: The comfortable, sculpted ergonomic shape naturally fits your hand, Smooth thumb control, precise tracking: Great cursor control on any surface. Adjust the cursor speed with Logitech options software, Perfect for tight workspaces: Because the trackball doesn’t move, it’s perfect for tight workspaces and busy desks, 2 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 33 ft (10m) range. Nominal value: 400 dpi, 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-month of use from a single AA battery with the USB receiver, you might just forget your trackball uses batteries at all, Convenient controls: Moving between documents or browsing your favorite websites is a breeze with large, easy-to-reach Back/Forward buttons and the precision scroll wheel. USB Receiver Height: 0.74 in, Width: 0.57 in, Depth: 0.24 in