input devices [4]

Electronic devices used to transmit data and commands to a computer.

optical mouse

Mouse in which the ball is replaced by an optical system (light-emitting diode and sensor); it has no movable parts.

optical sensor

Device that measures the mouse’s movements by analyzing the light rays (emitted by a diode) reflected from its support surface.

wheel mouse

Mechanical or optical mouse that contains a scroll wheel.

control button

Button that transmits various commands to the computer.

scroll wheel

Thumb wheel used to scroll down the contents of a window without using the scroll bar.

cable

Flexible cable containing the conductors by which the mouse is attached to the computer.

cordless mouse

Mechanical or optical mouse connected to the computer by infrared or radio signals.