Feature:1. Multifunctional Detector: A CO2 monitor is a small radar that monitors the ambient air for carbon dioxide, temperature and humidity.2. Infrared Absorption Sensor: The carbon dioxide detector adopts infrared detection technology to more accurately determine the air quality issues.3. Sound Light Alarm: High sensitivity NDIR CO2 sensor, CO2 sound and light alarm, monitor carbon dioxide anytime, anywhere, with mute function.4. Clear Display: Comfortable full color display, fully adjustable high and low alarm values, realtime display of carbon dioxide concentration.5. Wide Application: Used for air quality testing in cars, kindergartens, public places, rooms with closed doors and windows, and poorly ventilated offices.Specification:Item Type: Air Quality MonitorMaterial: ABSCarbon Dioxide Measurement Range: 370-9999Temperature Measurement Range: -20-60Humidity Measurement Range: 0-99%Temperature Accuracy: 3Humidity Accuracy: 5%Battery: Built in 1500mAh/18500 lithium batteryWorking Hours: Can work continuously for more than 8 hours.Power: USB/5VSize: Approx. 80 x 80 x 55mm/3.15 x 3.15 x 1.97inWorking Time: 8 hours400-450PPM (Excellent): Typical outdoor air rating.450-700PPM (Good): Typical in a well ventilated living space.700-1000PPM (Light Pollution): Poor ventilation living environment1000-2000PPM (Moderate Pollution): Air rating, insufficient oxygen, lethargic, and enough to cause complaints2000-5000PPM (Heavy Pollution): Stagnant, stale, stuffy air levels. Causes headache and drowsiness with lack of energy, decreased concentration, rapid heartbeat and mild nausea.5000PPM Or Above (Severe Pollution): Exposure can cause severe hypoxia, permanent brain damage, coma..Package List:1 xAir Quality Monitor 1 x Manual1 x Connecting Cable