Product Library / Plugs & Outlets

Legrand radiant Smart 15A Receptacle with Wi-Fi, Matter-Enabled, White (WWMRR15WH)

Compiled by SmartHomeWorkflow Research · radiant · Plugs & Outlets · ~$46.36 (at time of research — read from Legrand's own legrand.us product page, which showed 'In Stock' at this figure with an add-to-cart control. Never treated as a live price.)

⚠ Similar names, different products: Legrand sells two unrelated smart-home lines in the same house, and Home Assistant's own documentation is where the confusion bites: the 'Legrand' integration in Home Assistant is a virtual integration handled by the Netatmo integration, covering Legrand's Netatmo-based Home + Control range over a cloud connection. This receptacle is not part of that range — it is a radiant Collection Matter-over-Wi-Fi device, and the way to reach it in Home Assistant is the Matter integration, not the one with Legrand's name on it. Legrand also fields several near-identically-titled radiant Matter devices (a Smart Switch, a Smart LED Dimmer, a Smart 15A Plug-In Switch, a Smart Outdoor Dual Output Plug); this record covers the in-wall receptacle only.

Compatibility

Protocols: WIFI · MATTER^[1][5]

Needs before it works: Yes for every ecosystem path, and Legrand states it as a flat condition of use rather than as a footnote: 'Matter Controller Required: A compatible Matter controller is required for successful installation.' In practice that means a HomePod or Apple TV for Apple Home, a Matter-capable Echo for Alexa, a Matter-capable Google hub for Google Home, or a SmartThings hub — Legrand maintains its own controller list at legrand.us/matter. There is no Wi-Fi-only vendor-app path that works without one, which is a real difference from most Wi-Fi outlets in this subcategory.^[1]

Subscription reality^[1]

✓ Works without a subscription: Yes.

Vendor account required: No — no vendor account is involved.^[1]

No plan, paid tier or recurring charge appears anywhere on Legrand's product page, and the architecture leaves nowhere obvious to put one — Legrand states the device needs no manufacturer application at all for onboarding, so there is no Legrand account or service in the control path to attach a fee to. So we record no subscription on that basis. The honest limit is that this is the absence of paywall language on a first-party page rather than an explicit 'no subscription' statement.

Maintenance reality^[1]

• Works without the internet: Yes — the core function runs on the device or your home network. A vendor cloud may still be involved in remote access.^[1]
• A duplex receptacle replacement. ONE outlet is controlled and one is permanently live, which Legrand states twice and which decides how the device is actually used: 'The bottom outlet of the device is always on, while only the top outlet can be controlled', and in the feature list 'Single Controlled Outlet: Features a single controlled outlet and one always-on outlet.' Electrical specification as published: Amperage 15 A, Voltage 125.0 V, Frequency Rating 60 Hz, NEMA Configuration Code 5-15R, Indoor/Outdoor 'Indoor', two receptacles. Listing and compliance: cULus Listed, FCC Compliant, RoHS Compliant, UPC 785007449457, country of origin China, product line Pass & Seymour. Physical: 1.75 in deep, 2.68 in high, 1.71 in wide, 0.237 lb. Warranty '1-Year Limited Warranty', which is short for this category and worth weighing against the price. Radio: 'Wi-Fi Connected: Works with a home's existing secure 2.4 GHz Wi-Fi network' — 2.4 GHz only. A screwless radiant wall plate is included in the box. Installation: 'Installs easily in place of an outlet, neutral wire required', and the device carries a California Proposition 65 warning. We record it as working without the internet on Legrand's own affirmative statement rather than inferring it from Matter: 'Local Control: Devices are designed to work when your home loses connection to the internet. Devices communicate directly with a Matter controller, allowing for a faster, more reliable local processing of commands without needing an internet connection.'
• Security updates: radiant publishes no security-update support date for this model. That is a gap in what the manufacturer has published, not evidence either way — some makers declare a support period and some say nothing at all.^[1]

The catch

Only the top outlet is smart — the bottom one is permanently live by design, so the lamp or appliance you want controlled has to go in the right half, and nothing on the faceplate says which. A Matter controller is not optional: Legrand's own words are 'A compatible Matter controller is required for successful installation', so without a HomePod, Apple TV, Matter-capable Echo or Nest device, or a SmartThings hub already in the house, this is a receptacle you cannot commission. Installation is in-wall with a neutral required, it is indoor and dry locations only, and the radio is 2.4 GHz. The warranty is one year, which is short for a hardwired device meant to live in the wall for a decade. What you get for those conditions is the cleanest architecture in this subcategory: Matter built in rather than bridged, all four major platforms named by the manufacturer, no vendor app or account anywhere in the path — Legrand says outright that no manufacturer application is required for onboarding — and an explicit first-party statement that the device keeps working when the internet drops.

Who it's for

A household that already runs a Matter controller and wants a controlled receptacle that answers to the platform directly, with no manufacturer app, no account and no cloud between the switch and the outlet. It suits anyone standardising on Matter and anyone who specifically wants control that survives an internet outage, and the included screwless wall plate makes it a tidy swap in a room already using radiant trim. Look elsewhere if there is no Matter controller in the house and no plan to add one, if both outlets need to be controllable, if the network is 5 GHz only, if the location is damp or outdoors, or if a one-year warranty on an in-wall device is not acceptable.

Sources & method

Numbered sources below back the facts marked with the matching number above. This is a research profile: compiled from manufacturer documentation, certification registries, and published testing — we state facts, not verdicts, and we have not physically tested this unit. How we work →

Compatibility and lifecycle information reflects the last-verified date above and can change without notice (firmware updates, cloud-service changes, discontinuations). It is provided as-is, for information — verify with the manufacturer before purchasing. Spot an error? Tell us and we'll fix it. Full terms: Terms of Service.

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