Logitech M185 Mouse - Optical - Wireless - 3 Button(s) - Blue - Radio Frequency - USB - Scroll Wheel - Symmetrical. A simple, reliable mouse with plug-and-play wireless. Reliable wireless No delays or dropouts. The tiny wireless receiver gives you a connection you can count on. All-year power pack With 12 months of battery life, you don"t have to deal with the hassle of frequent battery changes. Built to last You"ll enjoy the high quality and reliability Logitech is known for-plus a 3-year limited hardware warranty.