Work in your comfort zone with Ergo M575S wireless trackball, developed by Logi Ergo Lab experts, user-tested and certified by ergonomists for 25% less muscle strain in your forearm (1). Move your cursor with smooth and precise thumb control, on a sculpted ergonomic design that keeps your hand relaxed and forearm in a more natural posture. It also tracks on most surfaces, and since it doesn’t need to be moved – ERGO M575S is perfect for tight setups and busy desks. Now with quiet clicks.