Enhanced optical sensor. Optical sensor technology improves precision and even lets you work on most surfaces like marble, wood and leather surfaces without the need of a mouse pad. Internet & multimedia hotkeys. Get instant access to your commonly used Internet and multimedia tools with the 17 built-in hotkeys this keyboard has to offer. Split ergonomic design. The design of this keyboard with splitted key zones and gently sloped shape encourages natural position of hands, wrists, and forearm in maximum comfort for long use. Integrated palm rest. Designed to keep your hands in the natural resting position, this not only relieves joint pain and improves posture, but has also been shown to relieve back pain and spinal discomfort. 2.4GHz RF wireless technology with On/Off switch. This keyboard and mouse work at any angle with a range of up to 30 ft. with no wires to get tangled. The On/Off switch helps conserve battery power on both devices, and the low battery indicator helps you know when it is time to change batteries. Built-in scroll wheel. The built-in scroll wheel makes scrolling within documents a breeze. Users can achieve higher work efficiencies by eliminating the need to switch between their keyboard and mouse. DPI Switch & navigation hotkeys. Quickly and easily adjust mouse DPI resolution for a faster response with the convenient DPI Switch located at the top of mouse. This mouse also includes two convenient side Internet forward & back buttons for quick Internet navigation. Low-profile chiclet keycaps. The low-profile chiclet keys provide a quiet, comfortable typing experience with its sleek and sturdy design and a 5 million keystroke life.