Note: In case of wireless mouse, the USB receiver will be provided inside or along with the mouse Ergonomic shape: Ergonomically sculpted design and soft rubber grips conform to your right or left hand to be naturally comfortable and the compact size makes it easy to take with you wherever you use your computer at home, at work, or anywhere else Convenient controls: Back/forward buttons and side to side scrolling plus zoom let you do more, faster (requires free Logitech options software).Wireless technology: Advanced 2.4 GHz wireless connectivity (Unifying supported) Long battery life: You might forget this mouse runs on batteries with 2 years of power from 2 AA batteries 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 USB connector is located underneath the item inside where the batteries are stored