Different Parts of Mouse and its Functions: A Guide

I don’t think I need to bore you with the importance of a mouse or do I?! Anyone reading this article already knows that just as they know the different types of mice.
But do you know the parts of mouse, the role that every single part plays?! I doubt that. If you knew, you’d probably not be here, now, would you?

Today, I’ll introduce you to the different parts of a computer mouse and explain the role of every single component involved.

Without wasting any time, let’s dive straight in!

What are the Different Parts of Mouse and their Functions?

1) Left Button

The left mouse button is typically the primary button on your mouse and plays a central role. It’s useful for selecting objects, highlighting text, or clicking on icons. Copying and pasting, launching programs, saving files, closing windows- this is required for practically every action on your computer.

2) Right Button

The right mouse button usually sits in the upper right corner, and it’s present for a whole different set of tasks. Its main role is to open up contextual menus when you click on files, highlighted text, or websites. These menus typically offer options that are related to whatever you’ve clicked on (like cut, copy, paste, properties, tools, font settings, opening, or deleting).

3) Scroll Wheel

Mainly used for navigating on pages, or for scrolling, the scroll wheel is the wheely thing between the left and right buttons. Also helps for zooming conveniently and acts as a third button when pressed down. This speeds up scrolling or comes in handy when you want to open a new tab.

parts of mouse

Source: UOW

4) Mouse Body

The mouse’s body, the part you hold, is typically crafted from plastic or metal with a smooth surface, ensuring smooth movement. Some mice are designed ergonomically for a comfy fit, reducing hand fatigue during extended use.

5) LED

The LED light, usually situated below the motion sensor, serves a dual purpose. It emits a red optical light to illuminate the surface beneath the mouse, helping in precise motion tracking.

Oh, and it also indicates the battery level during wireless mouse charging. Gaming mice often come with customizable RGB lights, while laser mice use an infrared LED invisible to the naked eye.

parts of mouse

6) Wireless Receiver

The wireless receiver, a compact plastic dongle, conveniently plugs into an available USB port on your computer. It features a small receiving antenna that captures the wireless signal transmitted by the mouse.

This receiver wirelessly communicates the mouse’s hand movements to the computer, eliminating the need for cords and cables.

7) Battery

Wireless mice rely on batteries for power, typically located at the mouse’s bottom. Many use standard AA or AAA batteries, which offer months or even years of use with regular usage.

In contrast, certain gaming mice feature built-in rechargeable batteries, conveniently chargeable via a USB cable.

8) Motion Detection Sensor

A motion detection sensor has a vital role. It senses when you move the mouse, relaying those movements to the computer, which in turn translates them into cursor movements on your monitor screen, whether for gaming or regular tasks.

Bonus Tip: If you ever encounter issues like a non-responsive mouse cursor on your laptop or desktop, it’s worth checking the motion sensor or its driver as a possible culprit.

9) USB

The USB cable serves as the direct link for wired mice to connect to your computer’s USB port. It allows you to control the arrow pointer on your screen by the transmission of data from the mouse to the computer.

parts of mouse

10) PCB

The PCB is the important element of the mouse that holds all of the other parts in place. It is a small, flat piece of greenish-coloured fibreglass with numerous tiny pathways. These pathways connect all of the mouse buttons, sensors, register, battery, and other electronic components to communicate with each other

parts of mouse

Source: PCBMay

A computer mouse’s Printed Circuit Board (PCB) contains various essential components:

  • Microprocessor: The mouse’s brain, controls all components and processes sensor data sent to the computer.
  • Transistor: Amplifies sensor signals, enabling the computer to interpret them.
  • Memory: Stores settings for buttons, sensors, drivers, and other features.
  • Register: Records movement data from motion sensors.
  • Capacitor: Stores electrical energy to power the mouse during use.
  • Diode: Allows current to flow in one direction, preventing damage from incorrect current flow.
  • Integrated Circuit: A chip on the PCB that manages sensor data processing and communication with the computer.
  • Transmitter & Receiver: In wireless mice, the transmitter (inside the mouse) sends data to the receiver (plugged into a USB port), allowing cursor control on a computer or laptop screen.

Special Parts of a Gaming Mouse

1) Side Buttons

These buttons are typically found on the left and right sides of gaming mice. You can assign specific actions to them, like reloading a weapon or jumping in games.

Some regular mice also feature these additional buttons, used for quick internet browsing by going back or forward between web pages.

2) Grips

Side grips and customizable weights are common features in gaming mice. They enhance your comfort, reduce hand fatigue, and can positively impact gaming performance. You can adjust the mouse’s weight by adding or removing weights until it feels just right in your hand, allowing for a personalized gaming experience.

parts of mouse


Among all the mouse components, the sensor takes the crown as the most important. It’s the part that detects movement and relays that crucial information to the computer. Without this sensor, the mouse would be unable to track movement and, as a result, wouldn’t function properly.

Not all mice are created equal. However, most mice do share some common components. You can usually expect to find a tracking mechanism, like a ball or optical sensor, buttons for various functions, and a scroll wheel for navigating through documents. Some mice come with extra features, such as additional buttons or even a trackpad, which can enhance their functionality for specific tasks or preferences.

Wireless mice use a wireless receiver to communicate with the computer, eliminating the need for cables. They also feature a battery compartment to power the mouse. On the other hand, wired or USB mice skip the receiver and simply rely on a cable connection to link the mouse to the computer.

The main distinction between laptop and desktop mice is their size. Desktop mice tend to be larger, while laptop mice are designed to be more compact and portable for use with laptops. Laptop mice often come with wireless connectivity, whereas desktop mice typically rely on a wired connection.

A port is like a gateway on the side or back of a device, designed for plugging in cables. The USB port is the most widespread, employed by both wired and wireless mice. However, some mice utilize a Bluetooth connection, which eliminates the need for any physical ports

Now that you know the main parts of a mouse and their functions, you can mouse more easily and with much more understanding.

Happy mousing 🙂

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