This is an amazing product. ERGO M575 features a super-compact footprint since it doesn’t move to control the cursor. It’s ideal for tight workspaces, or for those of us that have desks full of papers, personal items – and sometimes even a bowl of cereal. Get on a more ergonomic track with exceptionally precise trackball control. Your thumb will glide across the smooth ball surface with total ease thanks to transparent finish coating. And the high-performance optical sensor matches great accuracy with ultra-low power consumption. With two ways to connect – via Bluetooth Low Energy or the included USB receiver – ERGO M575 provides a powerful, reliable signal from up to 10 m away. Wireless range may vary depending on operating environment and computer set up Connect to either Windows or macOS and never worry about drop-offs or laggy connections. 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.