Logitech Wireless Mouse M815 is a simple, reliable mouse with Plug and Play wireless. You get the reliability of a cord with wireless convenience and freedom - fast data transmission and virtually no delays or dropouts. You\'ll enjoy the high quality and reliability. The tiny nano receiver works right away without software and is small enough to leave in your USB port, so you won\'t lose it. And on top of that, this comfy, contoured mouse treats your hand right. o Plug-and-play wireless connectivity o 1-year battery life o Logitech reliability with a 3-year guarantee o Plug-and-forget nano receiver that stays in your laptop o Comfy, contoured shape o Mouse o Nano receiver o 1 AA battery (pre-installed) o User documentation o 3-year manufacturer\'s guarantee and full product support