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