Work easily day or night with this illuminated rechargeable keyboard that automatically adjusts to brightness in room. Back-lit keys illuminate characters only, rather than the entire key, for less distraction. Hand proximity detection turns illumination on or off automatically. The PerfectStroke™ key system and Incurve Keys™ offer smooth and quiet typing on the full-size keyboard. Built-in rechargeable batteries eliminate disposable battery waste; on/off switch conserves battery. The tiny Unifying receiver stays plugged in and supports keyboard and compatible mouse. Sleek, slim, streamlined design.