Getting Started
DETAILED SETUP
1. Make sure the mouse is turned on — the number 1 LED on the bottom of the mouse
should blink quickly.
NOTE: If the LED is not blinking quickly, perform a long press (three seconds).
2. Choose how you want to connect:
o Use the included wireless USB receiver
Plug the receiver into a USB port on your computer
o Connect directly using Bluetooth
Open the Bluetooth settings on your computer to complete the pairing.
Click here for more details on how to do this on your computer. If you experience
issues with Bluetooth, click here for Bluetooth troubleshooting.
3. Install Logitech Options Software.
Download Logitech Options to use all the possibilities this mouse offers. To download
and learn more about Logitech Options, go to logitech.com/options.
LEARN MORE ABOUT YOUR PRODUCT
Product Overview
1 – MagSpeed scroll wheel
6 – USB-C charging port
2 – Mode shift button for the scroll wheel
7 – On/Off button
3 – Gesture button
8 – Darkfield 4000DPI sensor
4 – Thumb wheel
9 – Easy-Switch & connect button
5 – Battery status LED
10 – Back/forward buttons
Pair to a second computer with Easy-Switch
Your mouse can be paired with up to three different computers using the easy-switch button to
change the channel.
1. A short press on the Easy-Switch button lets you switch channels. Select the channel you
want and go to the next step.
2. Press and hold the Easy-Switch button for three seconds. This puts the mouse in
discoverable mode so that it can be seen by your computer. The LED will start blinking
quickly.
3. Choose how you want to connect the keyboard to your computer:
o Bluetooth: Open the Bluetooth settings on your computer to complete the pairing.
You can find more details here.
o USB receiver: Plug the receiver to a USB port and open Logitech Options. In
Options, select Add devices > Setup Unifying device, and follow the
instructions.
MagSpeed adaptive scroll-wheel
The speed-adaptive scroll wheel shifts between two scrolling modes automatically. As you scroll
faster, it will automatically shift from line-by-line scrolling to free-spinning.
Line-by-line (ratchet) mode — ideal for precise navigation of items and lists.
Hyper-fast (free-spin) mode — near-frictionless spinning, letting you fly through long
documents and web pages.
Switch modes manually
You can also manually switch between modes by pressing the mode shift button.
By default, mode shift is assigned to the button on top of the mouse. Use the Logitech Options
Software, to disable SmartShift if you prefer to stay in a single scrolling mode and shift
manually. You can also adjust the SmartShift sensitivity, which will change the speed required to
automatically shift into free spinning.
Thumb wheel
Scroll side to side effortlessly with a stroke of your thumb.
Install Logitech Options software to extend thumb wheel capabilities:
Adjust thumbwheel scrolling speed, and direction
Enable app-specific settings for the thumbwheel:
o Zoom in Microsoft Word and PowerPoint
o Adjust brush size in Adobe Photoshop
o Navigate your timeline in Adobe Premiere Pro
o Switch between tabs in the browser
o Adjust volume
o Assign custom keystrokes to the wheel rotation (up and down)
Gesture Button
Install Logitech Options software to enable gestures.
To use the Gesture button:
Hold down the Gesture button while moving the mouse left, right, up, or down.
Gesture Button
Windows 10
Mac OS
Single press
O
Task View
O
Mission Control
Hold and move
down
↑
Start Menu
↑
Mission Control
Hold and move up
↓
Show/hide desktop
↓
App Expose
Hold and move
right
→
Switch between desktops
→
Switch between desktops
Hold and more left
←
Switch between desktops
←
Switch between desktops
You can use gestures for desktop navigation, app management, pan, zoom, and more. You can
assign up to five different actions to the Gesture button. Or map gestures to other MX Master
buttons, including the middle button or manual shift button.
Back/Forward buttons
Conveniently located, the back and forward buttons enhance navigation and simplify tasks.
To move back and forward:
Press the back or forward button to navigate web or document pages, depending on the
location of the mouse pointer.
NOTE: On the Mac, enabling of the back/forward buttons requires installation of Logitech
Options software.
Install Logitech Options software to unlock new capabilities for the back/forward buttons.
In addition to enabling the buttons for use with Macs, Logitech Options software lets you map
other useful functions to the buttons, including undo/redo, OS navigation, zoom, volume
up/down, and more.
App-Specific Settings
Your mouse buttons can be assigned to perform different functions for different applications. For
example, you can assign the thumb wheel to do horizontal scrolling in Microsoft Excel and zoom
in Microsoft PowerPoint.
With Logitech Options, you can install predefined app-specific settings that adapt the mouse
button behavior to be optimized in selected applications.
The following app-specific settings have been created for you:
1 2 3
Default settings
Middle Button
Horizontal scroll
Back / Forward
Browser
(Chrome, Edge, Safari)
Open link in a new tab
Switch between tabs
Back / Forward
Microsoft Excel
Pan
(Hold and move the
mouse)
Horizontal scroll
Undo / Redo
Microsoft Word
Pan
(Hold and move the
mouse)
Zoom
Undo / Redo
Microsoft PowerPoint
Pan
(Hold and move the
mouse)
Zoom
Undo / Redo
Adobe Photoshop
Pan
Brush size
Undo / Redo
(Hold and move the
mouse)
Adobe Premiere Pro
Pan
(Hold and move the
mouse)
Horizontal timeline
navigation
Undo / Redo
Apple Final Cut Pro
Pan
(Hold and move the
mouse)
Horizontal timeline
navigation
Undo / Redo
With these settings, the Gesture button and the wheel mode-shift button are keeping the same
functionality across all applications.
Each of these settings can be customized manually, for any application.
Flow
With Logitech Flow, you can work on multiple computers with a single MX Master 3.
You can use the mouse cursor to move from one computer to the next. You can even copy and
paste between computers, and if you have a compatible Logitech Keyboard, such as MX Keys,
the keyboard will follow the mouse and switch computers at the same time.
You will need to install Logitech Options software on both computers and follow these
instructions.
Battery
Charge mouse battery:
Connect one end of the provided charging cable to the USB-C port on the mouse and the other
end to a USB power source.
A minimum of 3 minutes charging gives you enough power for a full day of use. Depending on
how you use the mouse, a full charge can last up to 70 days.
NOTE: Battery life may vary depending on user and operating conditions.
Check mouse battery status:
Three LED light on the side of the mouse indicates battery status.
Install Logitech Options software to receive battery status notifications, including low-charge
warnings.
LED Color
Indications
Green
From 100% to 10% charge
Red
10% charge or below
Pulsing green
While charging
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