The Adesso WKB-1200CB offers its users many great features. For people that want neither the large full-sized keyboard nor the mini-sized keyboard, this model is a great choice. Its compact sizing contains all the keys that a full-sized keyboard would have. With its wireless features, there are no tangling wires and its membrane key switch provides a quiet typing experience with life cycle up to 5 million keystrokes. When both units are in inactivity, the battery saving feature will prolong their battery lives extending their usage periods. The keyboard itself also offers popular hotkey commands conveniently located at your fingertips. Last but not least, the mouse?s enhanced optical engine ensures precise navigation. AAA battery included.