MX800 Combo is a powerful wireless keyboard and mouse combination. Type comfortably, even in low light, with intelligent auto-illuminated keys. Laser-etched Incurve keys position your fingers for optimum comfort while you enjoy the fluid, whisper-quiet PerfectStroke typing experience. Darkfield Laser Tracking gives you precise control on every surface, even 4mm minimum thick glass, where standard mice would fail. Easily navigate documents and web pages at your own pace with either hyperfast or click-to-click scrolling, and four customizable thumb buttons. Unifying receiver is small enough to stay in your USB port when you move around. Plus, you can easily add up to six compatible wireless devices.