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.