Spherically-dished keys match fingertip shape while the matte surface allows fingers to glide for efficient, comfortable work. Plus tactile reference for hand positioning makes it easy to orient fingers and stay in the flow. The mouse offers exceptionally fine tracking accuracy and control on large, high-resolution monitors. It is 5X7 more accurate than basic mice. It even tracks on glass2. Switch quickly to 8000 DPI from 4000 DPI with Logi Options+. Logitech’s Quiet Click technology eliminates 90% of distracting mouse click noise for a quieter, more focused work environment for everyone.Full-size keyboard with Smart backlighting. Hand proximity sensors turn the backlighting on and ambient light sensors adjust backlight brightness to better manage battery life. Engineered to conquer IT challenges, Logi Bolt technology is fully-encrypted and FIPS compliant when paired with the included Logi Bolt USB receiver.MX Keys Combo includes the MX Palm Rest which keeps hands in a relaxed position for all-day comfort.