input devices [5]![click to hear](/images/speaker.jpg)
Electronic devices used to transmit data and commands to a computer.
mechanical mouse ![click to hear](/images/speaker.jpg)
Mouse whose case contains a movable rubber ball underneath to direct the movements of the pointer on the screen.
ball ![click to hear](/images/speaker.jpg)
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](/images/speaker.jpg)
Removable part that surrounds the ball and closes the mouse case.
roller ![click to hear](/images/speaker.jpg)
Device that detects the ball’s movements and transmit them to the computer.
cable ![click to hear](/images/speaker.jpg)
Flexible cable containing the conductors by which the mouse is attached to the computer.
mouse pad ![click to hear](/images/speaker.jpg)
Smooth antiskid surface over which the mouse moves.