Meet Signature Comfort M840 L, a mouse designed for right hands with comfortable side grips, quiet clicks, SmartWheel scrolling, and effortless Bluetooth pairing across your devices. Connect wirelessly with Windows, macOS, Chrome OS, Linux, iPadOS, and Android, plus enjoy up to 24 months of battery life.

Key Features

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 - customise your buttons
Do more than you ever dreamed with the Logi Options+ App. Personalise 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.