Work easily day or night with this illuminated rechargeable keyboard that automatically adjusts to brightness in room. Back-lit keys provide precise illumination of characters only, rather than the entire key, for less distraction. Hand proximity detection turns illumination on or off when hands approach/depart keyboard area. The PerfectStroke™ key system and Incurve Keys™ offer comfortable, smooth, and whisper-quiet typing on the full-size keyboard. Keyboard has rechargeable batteries to eliminate disposable battery waste; on/off switch conserves battery power. The long-range Unifying receiver is small enough to stay plugged in and supports keyboard and compatible mouse. This slim-designed keyboard stands upright when not in use to conserve desk space. Wired/Wireless: Wireless; Maximum Wireless Range: 30 ft; Connector/Port/Interface: USB.