Succeed in a multi-device world with M720 Triathlon Mouse. You'll power through tasks by switching seamlessly between 3 computers, and fly through documents and web pages with hyper-fast scrolling. Boosted efficiency means this Bluetooth and Unifying mouse lasts for 24 months on a single AA battery. All that in a full-size shape fitting comfortably under your hand. Pair your mouse with 3 computers, then switch seamlessly between them at a touch of the button conveniently positioned under your thumb. The 3 illuminated numbers always let you know to which device you're connected. Fly through long documents and web pages with a spin of the wheel - and stop instantly - or switch to click-to-click scrolling when you need precision. A true athlete, M720 is designed to endure, with buttons built to withstand up to 10 million clicks. The large-sized, right-hand design fits comfortably in your palm, the rubber surface making it extra soft to the touch. You'll like this mouse's boosted efficiency, with 24 months of power on a single AA battery.( It may vary based on use and computing conditions).