3Camel says this is ATL for this mouse.
Advanced thumb control: The MX Ergo S Advanced wireless trackball mouse gives more control with less movement; switch between speed and high-precision tracking at the tap of a button. 20-degree tilt: A wireless ergonomic mouse with a tilt angle for better forearm posture, reducing muscle strain by 27% (1); now with 80% quieter clicks (5)
Contoured for your hand: The MX Ergo S is certified by ergonomists for improved comfort, with a sculpted ergonomic design, 20-degree tilt angle, and soft rubber grip; for medium- to large-sized hands
Bought one from Amazon this morning.