Logitech ERGO M575S Wireless Trackball Mouse, Wireless Ergonomic Mouse, Comfortable Thumb Control, Precise Tracking

Minimize movement and maximize your comfort with quiet clicks. With thumb control you won't need to move your arm to move the cursor, so your hand stays fully supported on the sculpted ergonomic design. A good and snug fit for most hand sizes. Certified by ergonomists to keep your hand and forearm relaxed. Dual connectivity using Bluetooth Low Energy or included Logi Bolt USB Receiver, 3 customizable buttons (Back/Forward, Middle click of the scroll wheel) with time-saving shortcuts and Smart Actions. Trackball, Scroll Wheel. Uses 1 "AA"battery (included). Battery life of up to 18 months. Graphite.