Sonoff AirGuard CO2 Monitor

Know Your Indoor Air Quality at a Glance

The SONOFF AirGuard CO2 is a smart Matter Over WiFi air-quality monitor designed to provide real-time information about the air in your home, office, bedroom, classroom or other indoor spaces. It simultaneously monitors CO₂ concentration, temperature and humidity, giving you a clearer picture of your indoor environment.

High-Precision NDIR CO₂ Sensor

The AirGuard CO2 uses a built-in NDIR sensor designed for accurate and responsive CO₂ measurement. SONOFF specifies an accuracy of ±(50 ppm + 5%), with readings refreshed every 5 seconds for timely monitoring of changing indoor conditions.

Real-Time CO₂, Temperature & Humidity Monitoring

Keep track of three important environmental measurements from one compact device. The large LCD display provides an at-a-glance view of current CO₂, temperature and humidity readings, while the temperature unit can be switched to suit your preference.

Smart Air Quality Advice

The AirGuard CO2 can combine your real-time indoor readings with outdoor conditions in your city to provide tailored suggestions for improving your indoor air quality. This makes it easier to identify when ventilation or other air-quality adjustments may be appropriate.

Three Flexible Alert Methods

Receive warnings when configured air-quality conditions require attention. The AirGuard CO2 supports app notifications, sound alarms and indicator-light alerts. A Do Not Disturb mode can also be configured when you want to minimise audible and visual notifications.

365 Days of Historical Data

Monitor longer-term indoor air-quality trends with up to 365 days of historical CO₂, temperature and humidity data. The recorded information can be viewed and exported, helping you analyse changes in your indoor environment over time.

Matter Over WiFi Smart Home Integration

The AirGuard CO2 supports the Matter protocol over 2.4GHz WiFi, allowing it to integrate with compatible smart-home platforms including Apple Home, Google Home and Amazon Alexa. Matter integration with third-party ecosystems requires a compatible Matter hub.

Works with eWeLink

The monitor can be added through the eWeLink app or through a Matter-compatible application. eWeLink provides additional smart-home functionality and access to historical monitoring data.

Hands-Free Air Quality Information

When connected to compatible voice-assistant platforms, the AirGuard CO2 can provide hands-free access to air-quality information. This allows you to check environmental conditions without needing to physically interact with the monitor.

Compact Desktop Design

The SONOFF AirGuard CO2 is designed for desktop placement and uses a USB Type-C connection for continuous power. SONOFF specifies dimensions of 70 × 103 × 26mm and a net weight of approximately 101g. The device is not designed for direct wall mounting because the rear ventilation openings are used for gas detection.

Technical Specifications

• Model: SAWF-08P
• Product: SONOFF AirGuard CO2
• Type: Matter Over WiFi Air Quality Monitor
• Measurements: CO₂, temperature and humidity
• CO₂ Sensor: NDIR
• CO₂ Accuracy: ±(50 ppm + 5%)
• CO₂ Refresh Rate: Every 5 seconds
• WiFi: IEEE 802.11 b/g/n 2.4GHz
• Protocol: Matter Over WiFi
• App: eWeLink
• Display: 3.73-inch LCD
• Interface: USB Type-C
• Input: 5V/1A
• Weight: Approximately 101g
• Dimensions: 70 × 103 × 26mm
• Material: PC + ABS
• Operating Temperature: -10°C to 50°C
• Operating Humidity: 5–95% RH, non-condensing
• Historical Data: Up to 365 days
• Alerts: App notifications, sound and light alerts
• Smart Home Compatibility: Apple Home, Google Home, Amazon Alexa and other Matter-compatible platforms
• Certification: CE, FCC, RoHS
• Installation: Desktop/stand
• Model Number: SAWF-08P