Gentle hold, comfy control
Feels like it was made just for you. The sculpted shape fits naturally in your hand. The thumb rest and extended rubber side grip give you confidence and control. It’s the perfect fit.
Mice · Logitech
Signature Comfort M840 L
Reference 910-007712, 910-007713, 910-007714
Bluetooth mouse for all-day comfort
- 4.8 in (121.8 mm)Height
- 2.93 in (74.3 mm)Width
- 1.7 in (43.2 mm)Depth
A natural fit in your hand
Shaped for right hands and built with cozy side grips, Signature Comfort M840 L helps you stay comfortable and in control, hour after hour.
Effortless scrolling, quiet clicks
Scroll line by line or fly through pages with SmartWheel—all with quiet clicks for a calm, focused workflow.
Make it yours - customize your buttons
Do more than you ever dreamed with the Logi Options+ App. Personalize your experience to make it work for you.
Easy-Switch and Bluetooth pairing for simple connections
Connect with Bluetooth, then swap between up to 3 devices instantly with Easy-Switch—just a tap, no dongle needed, perfect for multitasking.
Power that keeps going
Signature Comfort M840 L stays powered up for up to 24 months—no constant battery changes.
Works on nearly any platform
Don’t worry about your device’s operating system—connect wirelessly to Windows, macOS, ChromeOS, Linux, iPadOS, and Android.
Specifications
| Specification | Value |
|---|---|
| Signature Comfort M840 L (with battery) - receiver not included | |
| Height | 4.8 in (121.8 mm) |
| Width | 2.93 in (74.3 mm) |
| Depth | 1.7 in (43.2 mm) |
| Weight | 3.69 oz (104.6 g) |
| Signature Comfort M840 L (without battery) - receiver not included | |
| Height | 4.8 in (121.8 mm) |
| Width | 2.93 in (74.3 mm) |
| Depth | 1.7 in (43.2 mm) |
| Weight | 2.81 oz (79.6 g) |
| Sensor and tracking | |
| Sensor Technology | Pluto ONE |
| Nominal value | 1000 DPI |
| DPI (Minimal and maximal value) | 400-4000 DPI (can be set in increments of 100 DPI) |
| Tracking technology | Logitech Advanced Optical |
| Buttons | |
| Number of Buttons | 6 (Left/Right-click, Scroll-wheel middle click, side buttons, DPI button) |
| Gesture button | No |
| Number of programmable buttons | 4 (Scroll-wheel middle click, side buttons, DPI button) |
| Scroll types | |
| Scroll Wheel | SmartWheel |
| Horizontal scroll | Virtual |
| Thumb wheel | No |
| Features | |
| Customization app | Logi Options+, Logi Tune |
| Battery | |
| Battery type | 1 AA battery (Alkaline Battery) |
| Battery life | 24 months |
| Battery life with Logi Bolt USB Receiver | up to 24-months |
| Battery life with Bluetooth® | up to 24-months |
| Connectivity | |
| Connection Type | Bluetooth Low Energy Technology |
| Wireless range | 33-ft (10 m) |
| Unifying-ready mouse | No |
| Unifying-ready receiver | No |
| Multi-device pairing | Up to 5 devices |
| System requirements | |
| Bluetooth | Required: Bluetooth Low Energy, Windows 10, 11 or later, macOS 12 or later, Linux*, ChromeOS*, iPadOS* 15 or later, Android™ OS* 12 or later. (*Device basic functions will be supported without software for systems other than Windows and macOS) |
| Logi Bolt USB receiver | Compatible with Logi Bolt USB Receiver (not included), Not compatible with other Logitech USB receivers. |
| Customization app | Logi Options+, Logi Tune |
| Certified for | WWCB, Engineered for Intel Evo laptops |
| Warranty | |
| Warranty | 1-Year Limited Hardware Warranty |
| In the box | |
| Package contents | Mouse with 1 x AA battery (included) User documentation |
| Model variants | |
| 910-007712 | Signature Comfort M840 L - Graphite — Graphite |
| 910-007713 | Signature Comfort M840 L - Off White — Off White |
| 910-007714 | Signature Comfort M840 L - Black — Black |
FAQs
What is the difference between Signature Comfort Plus 850 L model and Signature Comfort 840 L model?
Signature Comfort Plus 850 L features built-in palm cushion, while Signature Comfort 840 L does not.
What is new about the comfort design here?
The mouse has a sculpted right-hand shape, rubber side grips and thumb support area. The sculpted shape is there to fit your hand naturally. Rubber side grips enable more precision and control. Thumb support area is there for added thumb comfort.
Is it suitable for long hours of typing and computer work?
Yes. Comfort features and less noisy operations are specifically designed to improve comfort during extended use.
Is this only for home offices?
No. It's designed for home, office, and hybrid environments — especially shared or flexible workspaces where less noisy operation and comfort matter.
Does Signature Comfort Plus support multiple devices?
Yes. The mouse supports multi-device pairing and Easy-Switch, allowing users to connect and switch between up to three devices.
Does it work across operating systems?
Yes. It supports major operating systems including Windows, macOS, ChromeOS, and others.
Can users customize buttons?
Yes. Through the Logi Options+ app, users can customize buttons and action shortcuts.
Is it quieter than standard mice?
Yes. It is designed with silent clicking to reduce distraction in shared and hybrid work environments.
What is the battery life?
Mouse battery life is up to 24 months. Actual battery life varies by usage.
Does it require charging cables?
No. The mouse has replaceable battery designed for long life.
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Interested in this product?
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