The Logitech MX Master 4 is an ergonomic wireless mouse designed for professional users seeking precision and comfort during long computer sessions. This successor to the MX Master 3 features advanced haptic technology that provides tactile feedback for various interactions, enhancing the user experience with subtle vibrations that confirm actions without audible clicks. The UltraFast scroll system offers both a precise click-to-click mode for detailed work and a high-speed mode for quick navigation through long documents and web pages. Connectivity options include both Bluetooth and 2.4 GHz wireless transmission via the included USB-C receiver, supporting simultaneous pairing with up to three devices and easy switching between them. The mouse charges via USB-C and provides up to 70 days of battery life on a single charge, with a fast-charging feature that allows for three hours of use after just one minute of charging. The ergonomic design for right-handed users measures approximately 12.4 cm in length, 8.4 cm in width, and 5.1 cm in height, weighing 141 grams for optimal comfort and control. It features a dark gray and black color scheme with rubberized grip areas on the sides and a magnesium alloy scroll wheel. Compatibility includes Windows 10 or newer, macOS 10.15 or newer, iPadOS 14 or newer, Linux, and Chrome OS. Additional features include customizable buttons via Logi Options+ software, 4000 DPI Darkfield high-precision tracking that works on virtually any surface, including glass, and an electromagnetic scroll wheel that automatically switches between modes based on scroll speed. The package includes the mouse, a USB-C charging cable, and the USB-C wireless receiver.