The Cordless Desktop S 510 with its zero-degree tilt is a perfect match with a flat screen systems. It includes advanced optical mouse with tilt wheel. The keyboard is leading-edge comfort and a built-in palm rest. Play music, quick image zooming and image rotation with one-touch keyboard controls and the programmable F-keys launch application with a single touch. The cordless optical mouse delivers fast, consistent performance with vertical and horizontal scrolling. Both the keyboard and mouse include convenient LED battery level indicators with it's sophisticated battery management technologies that will last up to 6 months or longer with a single charge. The flashing LED will give notice 10 days before battery needs charing. Logitech has encrypted and secure cordless technology which avoids interference for completely reliable performance. Easily pack and tote the mini-receiver with mouse and remote to travel and the mouse is equipped with an on & off switch to conserve battery power. Programmable functions on keyboard System Requirements - PC with Pentium processor or compatible, Windows XP, USB port, CD-ROM drive