SONOFF AirGuard CO2 SAWF-08P Matter Wi-Fi Air Quality Monitor

SONOFF AirGuard CO2 SAWF-08P Matter Wi-Fi Air Quality Monitor

Insights into what you can't smell

You often only notice a stuffy meeting room or bedroom when it causes headaches or fatigue, while elevated CO2 levels are usually the cause. The SAWF-08P continuously measures this with a professional NDIR sensor and simultaneously displays CO2, temperature, and humidity on a built-in LCD screen, so you know exactly when ventilation is needed.

Power and connectivity

The device connects via Matter over Wi-Fi (2.4 GHz, IEEE 802.11 b/g/n) and is powered via USB-C, 5V/1A. No battery mode is available; the monitor runs on an ESP32-based microcontroller that requires continuous power, making it suitable for fixed placement on a desk or shelf.

Functionality and settings

• NDIR CO2 sensor with range 400 to 5000 ppm and accuracy ±(50 ppm + 5%)
• Measurements are refreshed every 5 seconds
• Measures CO2, temperature, and relative humidity simultaneously
• Adjustable temperature unit to preference
• Warnings via sound, light, and push notifications when thresholds are exceeded
• Storage of up to one year of historical data with export capability
• Personal air quality advice based on indoor and outdoor measurements

Expansion and accessories

No additional hub is needed for Matter pairing as long as you have a Matter controller such as an Apple TV 4K, HomePod, or Google/Amazon hub at home. Also check out the range of other sensors to expand your air quality monitoring with, for example, temperature or humidity sensors elsewhere in the house.

Safety and reliability

The device's operating temperature is between -10°C and 50°C, with a humidity range of 5% to 95% RH without condensation. The device is intended exclusively for indoor use and offers no protection against other air pollutants such as particulate matter (PM2.5) or volatile organic compounds (VOCs).

Home Assistant

The SAWF-08P integrates into Home Assistant via the Matter protocol, which offers native Matter support via the Matter server add-on. Pairing is done by scanning the device via the Matter QR code on the device or packaging, after which the device is added to your Matter network. After pairing, entities for CO2 concentration (ppm), temperature, and humidity appear as separate sensors within Home Assistant. Local control without a cloud is theoretically possible via Matter's local communication layer, although functionality such as the annual history and improvement advice remains dependent on the eWeLink cloud.

Homey

For use with Homey, a Homey Pro is required due to its built-in Matter controller function; the regular Homey Bridge does not support this. Pairing is done via the Matter functionality in the Homey app with the same Matter QR code. Advanced features such as the one-year history and personalized air quality advice may not be available via Homey, as these depend on the SONOFF cloud infrastructure.

Other platforms

Thanks to Matter support, the monitor integrates directly with Apple Home, Amazon Alexa, Google Home, and Samsung SmartThings, without the need for an additional Zigbee or Thread hub. For Apple Home, a Matter pairing code scanned via a HomePod, Apple TV 4K, or iPad as a home hub is sufficient.

Automation examples

• Everyday: if the measured CO2 value exceeds 1000 ppm, automatically send a push notification "time to ventilate" to your phone via Home Assistant
• Advanced: if the CO2 value remains above 1500 ppm for longer than 15 minutes AND presence is detected in the bedroom between 22:00 and 07:00, automatically switch on mechanical ventilation and increase the ventilation level by one step

Points of attention

• No battery option, requires continuous USB-C power
• No PM2.5 or VOC detection, only CO2, temperature, and humidity
• Advanced features such as improvement advice and annual history are cloud-dependent
• Only suitable for indoor use
• Homey requires Homey Pro for Matter pairing

Box contents

• 1x SONOFF AirGuard CO2 monitor (SAWF-08P)
• 1x USB-C power cable
• 1x installation guide with Matter QR code

Compatibility

Compatible with Home Assistant (via Matter), Homey Pro (via Matter), Apple Home, Amazon Alexa, Google Home, and Samsung SmartThings.

Frequently Asked Questions

Does the SAWF-08P need a hub for Matter?

For use with Apple Home, Google Home, or Amazon Alexa, a Matter controller is required, such as a HomePod, Apple TV 4K, or similar hub; for Homey, a Homey Pro is required.

Does this monitor work with Home Assistant?

Yes, via the Matter protocol, the sensor integrates into Home Assistant with separate entities for CO2, temperature, and humidity.

Does the device run on batteries?

No, the SAWF-08P requires continuous power via the included USB-C cable and is not designed for battery use.

Can I expand the monitor with additional sensors?

The SAWF-08P is a standalone device without direct expansion modules, but you can combine it with other sensors in your smart home setup for broader air quality management.

Does the sensor also detect particulate matter or VOCs?

No, the device only measures CO2, temperature, and humidity; particulate matter (PM2.5) and volatile organic compounds are not supported.

What happens if the CO2 level becomes too high?

The monitor warns via sound, a light signal, and a push notification in the eWeLink app as soon as a set CO2 threshold is exceeded.

Do historical data and improvement advice also work without an internet connection?

No, the annual overview of historical data and personalized air quality advice depend on the eWeLink cloud and require an active internet connection.

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