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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.
optical mouse ![click to hear : optical mouse click to hear : optical mouse](../../images/speaker-vert.gif)
Mouse in which the ball is replaced by an optical system (light-emitting diode and sensor); it has no movable parts.
optical sensor ![click to hear : optical sensor click to hear : optical sensor](../../images/speaker-vert.gif)
Device that measures the mouse’s movements by analyzing the light rays (emitted by a diode) reflected from its support surface.
wheel mouse ![click to hear : wheel mouse click to hear : wheel mouse](../../images/speaker-vert.gif)
Mechanical or optical mouse that contains a scroll wheel.
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.
cordless mouse ![click to hear : cordless mouse click to hear : cordless mouse](../../images/speaker-vert.gif)
Mechanical or optical mouse connected to the computer by infrared or radio signals.