ABOUT THIS PRODUCT: 🔷Contoured shape with soft rubber grips provide all-day comfort 🔷Back/forward buttons and side-to-side scrolling plus zoom let you do more, faster Requires Logitech SetPoint software 🔷2-year battery life practically eliminates the need to replace batteries Battery life may vary based on user and computing conditions 🔷Comes with a tiny Logitech Unifying receiver that stays in your computer - plug it in, forget it