This mouse is a two button mouse that works on both Windows and Macintosh computers. Its symmetrical design is ideal for both right-handed and left-handed use. Its 800 dpi precision ensures extreme accuracy. It uses an included USB connection and therefore requires no batteries. It also functions well without a mouse pad because its built-in optical sensor can function on virtually any surface. This mouse features an incredibly thin retractable cord (30 inches long) that can be opened to whatever length you desire, and then retracts to a fully compact position. The mouse itself has two buttons and a scroll wheel, and it measures approximately 3" long x 1.75" wide x 1.25" high. It's an elegant, glossy black with brushed metallic buttons. I use this mouse on my laptop computer because it functions so much better than the trackpad. Because of its small size it easily fits into my laptop carrying case. You will be pleased with this product. Limit two per customer please.