Designed with your comfort in mind, the elongated arch and contoured shape provides relaxed control for either right or left-hand users. With a simple inserting the USB cord, you power your mouse and avoid ever replacing batteries. No software or downloads. Just start scrolling and clicking away. Navigate Windows XP, Vista, 7 or 8 with the convenient 3 control buttons and central scroll wheel.The optical tracking technology provides ideal tracking on most surfaces for accurate and smooth control.