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Logitech MX Master 4 is a high-performance wireless ergonomic mouse known for its advanced features like haptic feedback and an 8K DPI sensor. The provided part numbers, 910-007065 and 910-007566, correspond to different color variations of the mouse. 
 

• Haptic Feedback: This new feature provides tactile vibrations for specific actions, notifications, and shortcuts, which can be customized via the Logi Options+ software.
• Actions Ring: Located on the thumb rest, this button brings up a dynamic, customizable menu in the Options+ software, providing quick access to tools and filters and potentially increasing workflow speed.
• MagSpeed Scroll Wheel: This main scroll wheel can automatically switch between a precise ratchet mode for line-by-line accuracy and an ultra-fast free-spinning mode, capable of scrolling through 1,000 lines per second.
• 8K DPI Darkfield Sensor: The high-precision sensor works on virtually any surface, including glass with a minimum thickness of 4 mm.
• Quiet Clicks: The right and left click buttons feature Quiet Click technology, reducing click noise by 90% compared to previous models.
• Multi-Device Connectivity: The mouse connects wirelessly via Bluetooth Low Energy or the included Logi Bolt USB receiver and can pair with up to three devices simultaneously.
• Battery Life and Charging: The 650 mAh rechargeable Li-Po battery provides up to 70 days of use on a full charge, with a one-minute quick charge offering three hours of use.
• Ergonomic Design: The mouse has a comfortable, right-handed shape and is built with improved stain resistance.