The MX Ergo S is Logitech's most advanced ergonomic trackball mouse yet, with a 20-degree tilt angle and precise thumb control - user-tested and certified by ergonomists. The MX Ergo S wireless ergonomic mouse is sculpted to fit the palm of your hand while keeping it relaxed, and it tilts 20 degrees for 27% less muscle activity in the forearm (1), providing elevated comfort throughout your day. Work faster with 6 customizable buttons and a DPI button to effortlessly switch between speed and high-precision tracking. Now with 80% quieter clicks (5). For even more control that's tailored to your needs, assign time-saving shortcuts and Smart Actions using the Logi Options+ App (2). Connect your wireless mouse to 2 devices via Bluetooth or the included Logi Bolt receiver and switch between devices with a click of the Easy-Switch button. Charge the rechargeable mouse with a USB Type C to Type C or USB Type A to Type C cable (not included) and get 24 hours of use from a 1-minute charge. A full charge lasts up to 120 days (3). (1) In the forearm with 20-degree angle, compared to a Logitech M650 mouse. (2) Requires Logi Options+ app, available for recent versions of Windows and macOS (3) Battery life may vary based on user and computing conditions. (4) Excludes plastic in receiver, printed wiring assembly, cables, and packaging. (5) Sound level comparison between MX Ergo S and MX Ergo. Left click dBA measured by the Logitech internal lab at 1 m. (6) The device's basic functions will be supported without additional drivers for operating systems other than Windows and macOS.