CO2 Concentration Stage Alarm: This CO2 detector is functional with 5 stages of CO2 concentration—good stage (400-799 ppm), moderate stage (800-1199 ppm), poor stage (1200-1599 ppm), unhealthy stage (1600-1999 ppm), and very unhealthy stage (2000-5000 ppm). When the CO2 concentration value reaches or exceeds 1500PPM, the product will sound an alarm. WIFI Connection: Built-in WIFI, the sensor can transmit data to the cloud through WIFI, you can view real-time values at any time in the mobile APP. Remind the family to purify the air. Professional Design: The ventilation holes on all sides not only accelerate the convection between the air and the machine, so as to realize effective detection, but also provide good heat dissipation effect. Wall-mounted design with hook hole is suitable for more scene applications and more practical. Specifications: Plug: US / EU (Optional) Sensors: infrared CO2 sensor, optical sensor. Detection Technology: infrared detection technology Applicable Temperature: 0 ~ 50& 8451; Carbon Dioxide Detection range: 400 ~ 5000 ppm Carbon Dioxide Resolution: 1PPM Carbon Dioxide Accuracy: ±(50+5% * reading) PPM Temperature Detection Range: 0 ~ 50& 8451; Temperature Detection Accuracy: ±1& 8451; Humidity Detection Range: 0 ~ 99% RH Humidity Detection Accuracy: ±5% RH Power Specification: USB Type-C 5V = 3A Temperature Display: Celsius (switchable Fahrenheit) Material: ABS Item Size: 230 * 142 * 35mm / 9.05 * 5.59 * 1.38 inch Item Weight: 450g / 15.87oz Package Size: 270 * 234 * 46mm / 10.63 * 9.21 * 1.81 inch Package Weight: 720g / 25.4oz Package List: 1 * Air Quality Monitor 1 * 2m Type-C Charging Cable 1 * Charger 1 * Positioning Paper 1 * Self-Tapping Screw Set 1 * User Manual (English)