The Logitech MX Master 4 is a premium ergonomic wireless mouse for professionals, featuring a comfortable right-handed design, dual scroll wheels, Quiet Click buttons, and advanced connectivity (Bluetooth, Logi Bolt) for multi-device use. Its key innovation is haptic feedback for immersive control, coupled with the Actions Ring for app-specific shortcuts and an 8K DPI Darkfield sensor for tracking on any surface, including glass, all customizable via Logitech's Logi Options+ software.