Type 1   Feature: 1.MINI CO2 Meter -LCD Screen display -CO2 Technology : infrared ( NDIR) -Temperature unit between Celcius and Fahrenheit Switch -24 hours real time monitoring. 2.Detection range: CO2 ( 400-5000 ppm),Temperature(C/F),Humidity 3.Power supply：rechargeable Li-battery 1000mah includding USB  4.CO2 Alarm function Specifications: Material: ABS Color:Black Product size:70*80*35MM weight:150g what are included ：Main Unit+ manual+charging cable Package: 1 * Air Quality Monitor 1 * USB Reharging Cable 1 * User Manual                            Type 2            Features: Uses NDIR sensors, with high accuracy, stable performance, can accurately detect carbon dioxide value. Adopts air convection design, which can provides more accurate detection results, and the detection-range is from 400ppm to 5000ppm. Large color digital display, you can see the carbon dioxide concentration, temperature and humidity data clearly. Strong anti-interference ability, low consumption and long service life. The product does not need calibration, it can be tested after booting, and it can accurately detect carbon dioxide. Hundreds of ventilation holes reserved on the housing not only accelerate the convection between the air and the machine, thereby realizing effective detection, but also provide a fine heat dissipation effect. Widely applications: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, etc.. Specifications: Material: ABS Battery: 1 * 3.7V, 1600mAh battery (included) Display: digital display Detection ranges: 400-5000ppm CO2 concentration accuracy: ±(50ppm+5% readings) Temperature accuracy: ±0.3℃ Humidity accuracy: ±2%RH Voltage: DC5V/1A Recharging interface: USB Response time: ＜120s Value update time: ＜3s Operation temperature: -10℃ to 50℃ Working humidity: 0-95%RH Display size: 84 * 74mm / 3.31 * 2.91in Item size: 90 * 80 * 40mm / 3.54 * 3.15 * 1.57in Item weight: 113g / 3.99ounce Package size: 92 * 102 * 70mm / 3.62 * 4.02 * 2.76in Package weight: 240g / 8.47ounce Packing List: 1 * Air Quality Detector 1 * User Manual