The Sonoff AirGuard CO2 (SAWF-08P) is a smart air quality monitor designed to keep you informed about the environment in your home or office. It uses a professional NDIR sensor to measure carbon dioxide levels between 400 and 5000 ppm with an accuracy of ±(50 ppm + 5%), updating the readings every five seconds. Alongside CO2, the device tracks temperature and humidity, displaying all this information on a clear 3.73-inch LCD screen. Built from a durable PC+ABS blend, the monitor is compact, weighing only 101 g and measuring 70 x 103 x 26 mm. It connects via 2.4 GHz Wi-Fi using the Matter protocol, which allows it to work seamlessly with Apple Home, Amazon Alexa, and Google Home. Power is supplied through a convenient USB Type-C interface. To help you maintain a healthy space, the device sends push notifications and uses sound and light alerts when air quality drops. It stores up to a year of historical data that you can export for analysis and provides personalized tips for improving your indoor air based on a combination of your own data and local city weather.