The Logitech MX Master 4 refines the best productivity mouse rather than reinventing it: haptic feedback and the Actions Ring add a genuinely useful software layer, and Logitech fixed the sticky rubber, the old USB-A dongle, and wireless strength. But 3S owners already own nearly everything that matters here — buy it if you're upgrading from an older MX, not from the 3S.
— THE VERDICT · JUDGEANY EDITORSThe first real redesign in six years
Logitech launched the MX Master 4 on September 30, 2025 — the first full model change in the MX Master line in six years, according to Logitech's newsroom. It keeps the sculpted, right-handed ergonomic shape that made the series the default desk mouse for creatives and office workers, and adds two things the line has never had: a Haptic Sense Panel in the thumb rest and the Actions Ring shortcut overlay. This review pulls together manufacturer specs, published expert reviews, and owner impressions from forums and retail feedback. We don't run a test lab; the scores below are editorial judgments built on that evidence.
Haptics and the Actions Ring: the new software layer
The thumb-area Haptic Sense Panel vibrates to confirm actions — pairing, switching devices, snapping to Photoshop grids, nudging sliders — with four intensity levels (Subtle, Low, Medium, High) in Logi Options+, per Tom's Guide's two-week review. Press the thumb button and the Actions Ring appears: a ring of app-specific shortcuts — app commands, AI tools like ChatGPT or Copilot, automations — that you flick to select. XDA-Developers called the haptics plus Actions Ring the biggest and best addition in their 9.5/10 review; Tom's Guide said the haptics are the kind of feature you stop wanting to live without. Logitech claims Actions Ring users can save up to 33% of their time and cut repetitive mouse movements by 63% — treat those as company claims, not independent findings. The haptics need Logi Options+ running to work, and High intensity eats into battery life.
The fundamentals: sensor, scroll, battery, connectivity
Underneath, the hardware is evolutionary. The Darkfield sensor covers 200–8,000 DPI in 50-DPI steps (1,000 DPI default) and tracks on glass, per Logitech's spec sheet. The MagSpeed wheel still free-spins at up to 1,000 lines per second or locks into ratcheted precision; the thumb wheel handles horizontal scroll in Excel and Premiere Pro. The 650 mAh battery is rated up to 70 days per charge, with a 1-minute USB-C quick charge adding up to 3 hours of use. Connection is Bluetooth LE 5.1 or the new Logi Bolt receiver — finally a USB-C dongle — with Easy-Switch across three devices, and Logitech claims up to 2x stronger wireless connectivity from a reworked chip and antenna. Clicks are up to 90% quieter than the MX Master 3's, and the whole package weighs 150 g (up 9 g from the 3S) in a stain-resistant textured finish that replaces the old soft-touch rubber owners complained got sticky.
What owners consistently praise — and complain about
Owners consistently praise the ergonomics for long workdays, the MagSpeed wheel, the quiet clicks, and weeks-between-charges battery. The recurring complaints are just as consistent: 150 g is heavy for small hands and there is still no left-handed version; the 125 Hz polling rate is unchanged from the 3S, which owners on high-refresh displays keep questioning; some former 3S owners say the slightly reshaped, slipperier body is harder to lift and reposition than the 3S; and a vocal camp calls the haptics a gimmick they turned down or off. A practical note from launch coverage: there is no USB-C cable in the box.
MX Master 4 vs MX Master 3S: the upgrade question
The 3S already had quiet clicks, 8,000 DPI Darkfield, and the MagSpeed wheel — and owners note Logitech even brought the Actions Ring to older MX mice through an Options+ software update. What the Master 4 adds is haptics, the USB-C Bolt dongle, stronger wireless per Logitech, the stain-resistant finish, and more durable, easier-to-service construction that reviewers praise. Neowin scored it 7/10 "Good," praising the fit and finish while dinging the unchanged 125 Hz polling, the lack of onboard memory, and the premium over the 3S. If you own a 3S and don't crave thumb buzzes, keep it — most reviewers and owners say this is an upgrade for MX Master 2S-or-older users, not 3S owners.
Who should buy it
Anyone coming from a Master 2S or older, or from a generic office mouse, gets the most refined MX Master yet — best-in-class ergonomics, deep per-app customization, and the haptics-plus-Actions-Ring combo that reviewers found genuinely useful once customized. 3S owners can sit this one out unless haptics call to them. Check the live price on Amazon before deciding; the premium over discounted 3S stock is the main decision point.