UPDATE: Restock inbound next week. Reserve yours today if you want it. Manufacturer Warranty 1 Year. This is BRAND NEW SEALED not refurbished. Extended battery life Save time, money and the planet by practically eliminating battery changes. Hand-friendly design Contoured shape and finger rests poise your hand for comfortable control. Tiny Logitech Unifying receiver One plug-and-forget USB receiver stays in your notebook and let you connect up to six Unifying- compatible devices like keyboards and mice. To learn more about Logitech Unifying receiver click here > Hyper-fast scroll wheel Fly through long documents and web pages with a single spin. Precision cursor control Smooth, accurate laser tracking, even on challenging surfaces like a polished desk. The laser sensor does not work on glass or mirrors.