Description Features: Large LCD display with NDIR (non-dispersive infrared) is a new infrared sensor that works quickly and stably. Temperature and humidity detection,intelligent alarm system,Gas identification algorithm,Multiple anti-interference,Air convection technology and greenhouse compensation calibration. Real-time monitoring,Sensor measurement,range CO2 (400-5000ppm, 50+5ppm),Temperature (-40-85C 0.1C),Humidity(0-99% 5%). CO2 warning alarm.2 alert modes.Different color of indicator light and beeping alarm length at different air quality concentration,During the alarm period,Pre any key to lift the alarm. Two use way,Wall-mounted or Tabletop design.You can set it on a stand or mount it on the wall with a mounting hole on the back. Suitable for schools, greenhouses, office buildings, factories, hotels, transportation lines, etc. Specification: Material: ABS Size: 195x80x35mm/7.68x3.15x1.38in Power Supply: USB or Battery ( battery included) Package Includes: 1x Carbon Dioxide Detector note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.