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input devices ![click to hear : input devices click to hear : input devices](../../images/speaker-vert.gif)
Electronic devices used to transmit data and commands to a computer.
mechanical mouse ![click to hear : mechanical mouse click to hear : mechanical mouse](../../images/speaker-vert.gif)
Mouse whose case contains a movable rubber ball underneath to direct the movements of the pointer on the screen.
ball ![click to hear : ball click to hear : ball](../../images/speaker-vert.gif)
Movable sphere that moves over a flat surface (usually a mouse pad) to make the pointer move on the screen.
lock dial ![click to hear : lock dial click to hear : lock dial](../../images/speaker-vert.gif)
Removable part that surrounds the ball and closes the mouse case.
roller ![click to hear : roller click to hear : roller](../../images/speaker-vert.gif)
Device that detects the ball’s movements and transmit them to the computer.
cable ![click to hear : cable click to hear : cable](../../images/speaker-vert.gif)
Flexible cable containing the conductors by which the mouse is attached to the computer.
mouse pad ![click to hear : mouse pad click to hear : mouse pad](../../images/speaker-vert.gif)
Smooth antiskid surface over which the mouse moves.