1. Less movement, more comfort: The molded design of the ERGO M575S wireless trackball mouse keeps your hand relaxed for hours and allows for smooth, precise tracking with thumb control now with quiet clicks. 2. 25% less muscle strain in your forearm (1): This wireless ergonomic mouse is designed with experts at the Logi Ergo Lab, usertested, and certified by ergonomists for allday comfort. 3. Enhanced forearm posture (1): The ergonomic shape of the ERGO M575S supports your hand and aligns your forearm in a better posture throughout the day; with a snug fit for most hand sizes. 4. Work how you like it: Experience enhanced control with 3 buttons, timesaving shortcuts, and smart actions; adjust cursor speed to your preferences. 5. Save space with thumb control: The ERGO M575S allows you to move the cursor without moving your hand, making it ideal for small or spacesaving configurations and use on any surface. 6. Easy to connect, long battery life: Connect your ergonomic wireless mouse via Bluetooth or the included Logi Bolt USB receiver and benefit from up to 18 months of battery life (AA battery included) (3).