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• Controls a pointer that is displayed on the monitor.
• Has usually arrow like shape.
• Can have one or more buttons and a wheel button to scroll over the pages.
• Used to select commands and to control information.

Working of optical mouse:

• Contains a small camera which takes more than thousands of snapshots every second.
• Small LED (light emitting diode) provides light underneath the mouse.
• Helps to highlight slight differences in the surface underneath the mouse.
• These differences are reflected back into the camera for digital processing.
• This comparison finds speed and direction of mouse movement.

Types

Mechanical mouse:

• It contains a rotating ball on the bottom and attached with a cord to system unit.
• As it moves the roller rotates and controls the pointer on the monitor.

Optical mouse:

Refer working of mouse explained above.

Wireless mouse:

• Allows cordless access to the computer.
• Contains a receiver station that uses a PS/2 or USB connection to plug.
• Transmits data via infrared or radio frequency.
• Uses alkaline batter as a power supply.