Less Movement, More Comfort: The sculpted shape of the ERGO M575S wireless trackball mouse keeps your hand relaxed for hours of smooth, precise tracking with thumb control - now with quiet clicks 25% less muscle strain in your forearm (1): This wireless ergonomic mouse has been developed with Logi Ergo Lab experts, user-tested and certified by ergonomists for all-day comfort Improved forearm posture (1): The ergonomic shape of the ERGO M575S supports your hand and realigns your forearm into a better posture throughout the day; a good fit for most hand sizes Work it your way: Experience enhanced control with 3 customisable buttons, time-saving shortcuts, and Smart Actions; adjust the cursor speed to your preference with the Logi Options+ App (2) Save space with thumb control: With the ERGO M575S, you can move your cursor without moving your hand, making it ideal for small or space-saving setups and for use on any surface Easy to Connect, Long Battery Life: Connect your ergonomic wireless mouse using Bluetooth or the included Logi Bolt USB receiver; enjoy up to 18 months of battery life (AA battery included) (3) Made with recycled plastic: The plastic parts in the ERGO M575S Bluetooth trackball mouse are made of certified post-consumer recycled plastic (Graphite: 52%, Off-White: 21%) (4)