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Logitech Signature Comfort M840 L Wireless Mouse Bluetooth - Off White8.4Our score 4 photos
LBrandLogitechLLogitech129 products in our catalogSee all Logitech products →ID DBD-10667

Logitech Signature Comfort M840 L Wireless Mouse Bluetooth - Off White

8.4/10 our score 4.2 (71 ratings on Amazon)

Comfy grip, every click: Contoured mouse shaped for right-handed use and adapted for most hand sizes, this comfortable mouse with cozy side

Battery Average Life24 monthsOperating SystemChrome OS

About this item

  • 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
Category: MiceRanked #99 of 180 in Mice
8.4Our score
Our verdict

Comfy grip, every click: Contoured mouse shaped for right-handed use and adapted for most hand sizes, this comfortable mouse with cozy side

Ranked #99 in Mice · 4 things we like

Quick answer The Logitech Signature Comfort M840 L Wireless scores 8.4/10 with us. Amazon owners rate it 4.2 out of 5 across 71 reviews, below the 4.4 average of the 166 products we track in Mice. It was listed at $39.99 on Amazon when we last checked in September 2026. Key facts: battery average life 24 months, operating system Chrome OS.

Meet Signature Comfort M840 L, crafted for all-day ease. The mouse is shaped for right hands and sized just right, with cozy side grips for relaxed control no matter what your day holds. Enjoy quiet clicks and SmartWheel scrolling, so you can move smoothly through documents line by line or fly through web pages—without noisy distractions.

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. It’s built for multitasking, with Easy-Switch letting you instantly swap between up to three connected devices with just a tap. Bluetooth pairing setup is simple, and there’s no dongle required for wireless connection, so switching between work and personal life is effortless.

Signature Comfort M840 L works with nearly any platform. Connect wirelessly to Windows, macOS, Chrom

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Product information

24 specifications
Additional FeaturesLightweight, Portable, Soundless, Wireless
Antenna LocationEveryday Comfort, Gaming, Office, Student
Battery Average Life24 months
BrandLogitech
Button Quantity6
ColorOff White
Compatible DevicesPersonal Computer
Connectivity TechnologyBluetooth, Radio Frequency, USB
Enclosure MaterialPlastic
Hand OrientationRight
Hardware PlatformLinux, Mac, PC
Included Components1 Alkaline AA Battery (Installed), Documentation, M840L Mouse
Item Dimensions L x W4.8"L x 2.93"W
Item Weight107.9 g
Mfr Part Number910-007713
Model NameM840L
Model Number910-007713
Mouse Maximum Sensitivity4000 dots_per_inch
Movement DetectionOptical
Number of Batteries1 AA batteries required. (included)
Operating SystemChrome OS
Power SourceBattery Powered
Style NameNo Palm Cushion
Warranty Description2 Years Limited Hardware Warranty

Pros & cons

What we like
  • 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
What could be better

    Logitech Signature Comfort M840 L Wireless: questions & answers

    Is the Logitech Signature Comfort M840 L Wireless worth buying?

    Yes, for most buyers it is a safe choice. We score the Logitech Signature Comfort M840 L Wireless 8.4 out of 10. Amazon owners rate it 4.2 out of 5 across 71 reviews, below the 4.4 average of the 166 products we track in Mice.

    How much does the Logitech Signature Comfort M840 L Wireless cost?

    It was listed at $39.99 on Amazon when we last checked in September 2026. Amazon prices change daily, so use the price button on this page to see the current figure.

    What are good alternatives to the Logitech Signature Comfort M840 L Wireless?

    Similar, well-rated products in our catalog: Logitech Signature Comfort Plus M850 L (9.8/10, 4.2 stars from 122 owners); Logitech Lift (8.8/10, 4.4 stars from 904 owners); Logitech Signature Plus M750 Wireless Mouse (8.8/10, 4.4 stars from 170 owners).

    Logitech Signature Comfort Plus M850 LLogitech LiftLogitech Signature Plus M750 Wireless Mouse

    Customer reviews

    All reviews on Amazon
    4.271 global ratings
    5 star63%
    4 star13%
    3 star13%
    2 star0%
    1 star13%

    Breakdown from the 8 most helpful reviews we imported.

    D
    DeVera
    Verified purchaseAugust 2, 2026
    Perfect for small hand

    This is great for my smaller hand. It works well and is comfortable to use. I would recommend.

    N
    None Given
    Verified purchaseJuly 9, 2026
    The M840 L is just right, IMO

    The Logitech Signature Comfort M840 L is a GREAT mouse IMO!It is a relatively large mouse, if that is what you are looking for - larger than the M650L and M720 - and just the right size for those who prefer to rest their hand ON the mouse as opposed to HOLDING the mouse between the fingers. I tried all three and the M840 L was the stand out model.It also has Logitech "soft click" tech which, if you're like me, once you get used to soft click, you won't want to go back to firm 'clicky' old-school mice like the M720.Significantly cheaper too than the blingy MX line, and just as good without adde

    S
    Sasha
    Verified purchaseAugust 14, 2026
    OKish office mouse

    Better than my old M720, but not good enough for fine selection and editing small fonts. Also too big for M size hands.

    S
    SEE
    Verified purchaseAugust 31, 2026
    Good value!

    Works flawlessly.

    J
    Jim
    Verified purchaseJuly 10, 2026
    Love this mouse

    I love Logitech products and this one is no exception. Smooth, quiet and with a solid feel why only 4 stars then.I’m having trouble getting used to the larger width and the sloped sides, but that’s just me.I think I’m just used to the rounded, “slab” sides of my former mouse.

    A
    Amazon Customer
    Verified purchaseAugust 30, 2026
    Feels great and is very responsive

    I bought this to replace my m720 Triathlon, and I was skeptical about the shape. However, this mouse turned out to be very comfortable. Plan to buy a backup to keep with me.

    K
    Kathy Seigel
    Verified purchaseAugust 26, 2026
    Stooped working

    Stopped working after 2.5 months.wont pair ny more with any device. I even changed the battery

    S
    Sang G
    Verified purchaseJuly 25, 2026
    It's better than I thought.

    The mouse is a perfect size for the hand; in my opinion, this is the size to choose for true comfort. I also like its shape.

    Customer reviews are shown as published on Amazon and are not written by Do Best Deal.