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The AutoUp FlexGrip E1900 is the most customizable ergonomic mouse ever created, featuring a modular system of interchangeable components that allows you to configure the mouse to your exact anatomical requirements rather than adapting to a one-size-fits-all design. The core body accepts three different side panel sets, narrow, standard, and wide, enabling the grip diameter to be adjusted in 3mm increments to perfectly match your hand width and preferred grip tension. Three different palm arch inserts, low, medium, and high, snap into the top shell to match your natural palm curvature, a feature that ergonomic studies show significantly reduces the muscle activation required to hold the mouse. The thumb shelf adjusts laterally by 8mm to position under your natural thumb resting point regardless of hand anatomy. A tilt mechanism adjusts the mouse angle from 0 to 15 degrees in 5-degree increments, moving from flat conventional orientation toward a more vertical ergonomic posture as your comfort and therapy plan requires. The central sensor module maintains 2,400 DPI optical precision regardless of configuration. USB wired connection with a 1.8m cable delivers consistent performance. Five standard buttons with light actuation force minimize clicking effort throughout the day. A comprehensive online fitting guide with hand measurement tool helps new users select their optimal configuration. Replacement panels and inserts are sold individually, allowing upgrades and experimentation without purchasing a new mouse. All materials are hypoallergenic and free from common contact irritants. The FlexGrip E1900 ships with a full set of all panels, inserts, and tools for immediate exploration of configurations. The AutoUp FlexGrip E1900 represents the future of ergonomic design: personalized, adaptive, and built around you.