Logitech M840 L Bluetooth Optical Mouse - Graphite

Wireless mouse featuring cozy side grips, quiet clicks, SmartWheel scrolling, and easy Bluetooth pairing for all-day comfort.

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.

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.

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.

Sensor & 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

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

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

With Battery (receiver not included)

• Dimensions (HxWxD): 121.8 x 74.3 x 43.2 mm
• Weight: 104.6 g

Without Battery (receiver not included)

• Dimensions (HxWxD): 121.8 x 74.3 x 43.2 mm
• Weight: 79.6 g

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.
• 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