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 2 AA batteries