Logitech Wireless K400R 79 Key Slim Keyboard w/3.5" Touchpad & Nano Transceiver Three year keyboard battery life Logitech? Unifying receiver - The tiny receiver stays in your notebook. Plus, you can easily add a compatible wireless mouse or keyboard?without the hassle of multiple USB receivers. Advanced 2.4 GHz wireless - So you can work or play in more places?like your comfy couch?the long-range wireless connection virtually eliminates delays, dropouts, and interference. Wave shaped key frame - Your fingers vary in length. So with its gradual wave-shaped contour, this keyboard supports the actual, varied lengths of your fingers. Programmable keys - You?re in charge with programmable F-keys. you can easily customise to open your favourite applications, folders, or Web pages.