What's Matter WM CO2 Sensor

CSA model/software recordCertification record

Matter certified: Yes. CSA certificate CSA2653QMAT56022-24, certified Oct 13, 2026. We have no verified store link for it yet. Certificate data: CSA ledger read November 10, 2026.

Works with: Matter certified, so it can work with Matter apps such as Apple Home, Google Home, Alexa and SmartThings when the app supports its device type; supported features vary by app. The maker hasn’t named platforms on a page we hold.
Network & hub: Thread; needs a Thread border router as well as your platform’s Matter controller

Updated Nov 2, 2026: the last change to this page’s certification, platform or store facts.

Certification record

A Matter certification on file for this model. There is no product photo or store link for it yet.

Certificate ID: CSA2653QMAT56022-24
Certified: Oct 13, 2026
Maker: What's Matter
Certificate holder: What's Matter Inc.
Device type: Sensors
Connection: Thread, Bluetooth, Matter
Firmware: 1.0.0

No US store link yet.

We link to a store only after its listing matches this exact model, region and package.

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Matter 1.5 certificate

Its certificate, CSA2653QMAT56022-24, is for Matter 1.5, certified Oct 13, 2026. The Matter version is the specification version on the certificate's ledger record.

Source: CSA Distributed Compliance Ledger, read Nov 10, 2026.

What Matter 1.5 added, and which devices use it →

What's Matter WM CO2 Sensor is a smart sensor. It is listed as a Thread device, so Matter setup needs a Thread border router such as a HomePod mini or a Google Nest Hub (2nd gen). It is CSA Matter certified (October 13, 2026), so it can work with Matter apps such as Apple Home, Google Home, Alexa and SmartThings when the app supports its device type; supported features vary by app.

ThreadBluetoothMatter