Feature: 1. Multifunctional: The CO2 detector has a compact body with a cut out back for easy portability and airflow. The large colour LCD digital screen makes it easy to identify and read. Not only can it monitor CO2 levels, but also temperature and humidity. 2. NDIR Sensor Technology: This CO2 detector uses high accuracy NDIR sensor technology to accurately and quickly detect CO2 levels. It also performs a hazard assessment and warns when the CO2 in the air exceeds a set alarm value (alarm value: 1000 PPM), alerting people to open windows or turn on air purifiers to keep the air balanced. 3. High Sensitivity: This CO2 detector uses an intelligent air semiconductor sensor to detect the temperature and humidity values of the air. It is more sensitive, accurate and stable compared to ordinary sensors. 4. Long Lasting: The CO2 detector has a built in 1600mAh battery. When fully charged, it can be used continuously for approximately 8 hours. So don't worry, take the CO2 meter with you wherever you want to go. 5. Wide Application: This CO2 detector is essential for a home. Helping to detect gas and air pollution in homes, kitchens, bedrooms, offices, schools, cars, hotels, travel, camping, parties and other places, always protecting you and your family in healthy air conditions. Specification: Item Type: Carbon Dioxide Detector Material: ABS Display: Colour LCD display Carbon Dioxide Detection Technology: NDIR Automatic Calibration: Automatic calibration, manual calibration also supported CO2 Detection Range: 400-5000 ppm (1ppm accuracy) CO2 Alarm Value: 1000 ppm, alarm value can be set manually between 800 ppm and 2000 ppm CO2 Alarm: On Off function Atmospheric Pressure: 86Kpa - 106Kpa Sampling Time: 1.5 seconds Detection Temperature (℉ ℃ switching): -10°C-50°C 14-122°F, Humidity: 20%-85%RH (accuracy ±4%RH) Storage Temperature: -10°C - 60°C Battery: 1 x 18650 1600mAh lithium ion battery (included) Charging: DC5V DC power charging via micro USB port. Package List: 1 x Carbon Dioxide Detector1 x Instruction Manual1 x USB Cable Note: 1. The CO2 detector needs to be calibrated automatically each time it is switched on, so please place the air quality detector in a ventilated area and calibrate it for 1‑2 minutes before the CO2 detector can be used normally.2. Please allow for differences (approx. ±50 ppm) compared to other CO2 meters. After all, different CO2 meters use different NDIR sensors, so their test results are different. Thank you for your understanding.