Computer mice. Coloured X-ray of four computer mice" and their attachment leads. A "mouse" is a computer peripheral device. It has a set of control buttons which are operated by the index and third fingers of the hand. Each mouse contains a small rubber ball that spins as the mouse slides over a flat surface. Electronic sensors detect the ball's movements and translate them into corresponding movements of a pointer or other icon on a computer screen. The mouse allows novices to use computer programs without having to type complex codes on a keyboard."