USB port Comfortable, contoured shape fits both left and right hands Easy to install and use, no special software Second button to access Windows menus for convenient shortcuts This Logitech® mouse is an ambidextrous, for right and left hand use, 3-button optical wheel mouse that plugs into a USB port. The mouse comes with a ratcheting wheel centered between the two button keys. The wheel may be moved slowly in incremental ratchets or quickly with a single, sweeping motion of the finger to rapidly advance through multiple ratchets. The wheel also functions as a third button when it is activated by pressing on it. The mouse glides across most surfaces, recording motion optically without a ball or rollers.