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) LONG BATTERY LIFE You might forget this mouse runs on batteries with 2 years of power from two 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 Note : Please note the USB is in the mouse. Slip off the cover and the USB and batteries are there