Overview

  • Comfy grip, every click
    Contoured mouse shaped for right-handed use and adapted for most hand sizes, this comfortable mouse with cozy side grips make your workday more comfortable
  • Scroll faster, stay focused
    Scroll line by line or fly through pages with SmartWheel; quiet clicks reduce noise in shared or home offices
  • Make it yours
    Customizable buttons via Logi Options+ adapt to your tasks and help you do more; in the app you can boost productivity across apps, adjust DPI levels and personalize your workflow.
  • Simple connections
    Connect this multi-device mouse with Bluetooth pairing, then swap up to 3 devices instantly with Easy-Switch—just a tap, no dongle needed; perfect for multitasking
  • Power that just keeps going
    Logitech Signature Comfort M840 L wireless Bluetooth mouse stays powered up for up to 24 months—no constant battery changes
  • Power that just keeps going
    Logitech Signature Comfort M850 L wireless Bluetooth mouse stays powered up for up to 24 months—no constant battery changes
  • Works on nearly any platform
    Compatible with Windows, macOS, Chrome OS, Linux, ipadOS and Android; one mouse for all your devices and desk setups
  • Designed for sustainability
    The plastic parts of Signature Comfort Plus M850 L are made with a minimum of 49% post-consumer recycled plastic

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Specifications

Capacity & configuration

Mouse Type
Standard
Lighting Type
None
Connection Type
Wireless

Dimensions & weight

Product Name
Signature Comfort M840 L Wireless Bluetooth Mouse with Silent Clicks and Customizable Buttons
Adjustable Weight
No
Product Height
1.7 inches
Product Length
4.8 inches
Product Width
2.93 inches
Product Weight
104.6 grams

Features

Color
Black, Off-white
Brand
Logitech
Mouse Operation
Button(s)
Mouse Grip Style
Ergonomic
Handedness
Right-handed
Tracking Method
Optical
Maximum Sensitivity
4000 dots per inch
Minimum Sensitivity
400 dots per inch
Number of Buttons (Total)
6
Wireless Connectivity
Bluetooth
Operating System Compatibility
Windows
On/Off Switch
Yes
Rechargeable Battery (Mouse)
No
Battery Size
AA
Number of Batteries Required
1
Batteries Included
Yes
Mouse Pad Included
No
System Requirements
Via Bluetooth Low Energy Wireless Technology, Windows 10, 11 or later, macOS 12 or later, Linux, ChromeOS, iPadOS 15 or later, Android OS 12 or later
UPC
097855210036, 097855209931

Power & warranty

Model Number
910-007714
Mouse Power Source
Battery-powered
Warranty - Parts
1 year limited
Warranty - Labor
None

Warranty & protection

Included manufacturer warranty

See manufacturer documentation.

Register your product with the manufacturer within 30 days of delivery.

Warranty service

Manufacturer warranty claims are handled by the manufacturer. We are happy to help you find the right contact: (888) 419-6820.

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Customer reviews

Write a review
ROBERTROct 23, 2026 · Verified purchase ★★★★★

Nice mouse! - Works well, very quiet. Wireless range is great, the computer is a few feet away.

CORYDOct 2, 2026 · Verified purchase ★★★★★

Best mouse I ever owned! - Right when I pulled the battery tab, the computer connected it instantly! The clicks make no noise at all! Very silent and responsive! Extremely satisfied! I have never paid so little for so much!

DOUGMOct 2, 2026 · Verified purchase ★★★★★

Easy to use Bluetooth Mouse - After using this product for a while I find it meets all of my needs and is easy to use. The set up was fast and easy right out of the box and I would recommend this to anyone looking for one to use with their own MacBook Air.

WILLIAMHOct 2, 2026 · Verified purchase ★★★★★

Hand mouse - Works very well, well made would recommend i liked it very well use it every day good for class work too

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Questions & answers

Ask a question

Email [email protected] or call (888) 419-6820 during business hours.

Free U.S. shippingOn every order. Leaves our store in 1–2 business days, arrives in 3–5 business days.
Free returns for 30 daysNo restocking fee. We email you a prepaid return label.
We can install it tooOptional in-home delivery, installation and haul-away on large appliances.
Talk to our team(888) 419-6820 · Mon–Sat