Logitech Ergo M575S Wireless Trackball Mouse, Wireless Ergonomic Mouse with Bluetooth and Encrypted Dongle, Comfortable Thumb Control, Precise and Smooth Tracking, for PC/Mac – Graphite Blue Ball

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