Feature: 1. 3 in 1 Design: This carbon dioxide detector has a 3 in 1 design with an infrared sensor to detect temperature, humidity and carbon dioxide. 2. LCD Display: The portable mini CO2 detector has a LCD display, which is highly accurate display, easy to read, and can be manually calibrated. 3. Compact and Portable: The 3 in 1 CO2 detector's small size makes it easy to carry as a decoration to check air quality anytime, anywhere. 4. Large Capacity Battery: Digital CO2 meter adopts rechargeable battery, which can be used for 24 hours on a single charge and has a long service life. 5. Multi Purpose: Suitable for home, school, office, tourism, indoor and outdoor, agricultural planting, production warehouse and other occasion. Specification: Item Type: Infrared Mini CO2 Detector Material: ABS, PC Size: Approx. 73 x 73 x 18mm/2.9 x 2.9 x 0.7in Display: LCD Display Prep Time: About 35s Refresh Rate: About 2s Calibration: Manual Calibration CO₂ Concentration Measurement Range: 400-5000 ppm±(50 ppm) Number Accuracy: ±(50 ppm+5%) Battery Capacity: 1000 mAh Li ion Battery (Included) Charging Method: USB Type C Input Voltage: DC5V 0.5A Gross Weight: Approx. 113g/3.9oz. Package List: 1 x Host1 x USB Cable1 x Manual Note: Please allow some errors due to manual measurement.