Logitech M545 Wireless Mouse &ndash; Side-to-Side Scroll Wheel and 2-Thumb Buttons Make Computer and Laptop Navigation Effortless, Ergonomic Shape for Right/Left Hand Use, USB Unifying Receiver, Black CONVENIENT CONTROLS - Dual-axis scroll wheel and easy-to-reach Back/Forward buttons make moving quickly between documents or browsing your favorite Web sites a breeze USE ANYWHERE - perfect for use with Mac or Windows computers and laptops LONG BATTERY LIFE - 18 month battery life and smart sleep mode help you go longer between battery changes PROGRAMMABLE CONTROLS - Configure the buttons to do exactly what you want like switching applications, opening browser windows or jump to full screen while watching videos PLUG'N'PLAY CONNECTION - Nano-sized Logitech wireless unifying receiver stays in your computer plug it in, forget it, even add compatible wireless devices without multiple USB receivers