User can select one among five preset CO2 control values ( 1000, 1125, 1375 and 1500 PPM) User can select one among five preset Elevation values for improved CO2 control in higher altitude ( sea level, 1000 3000, 5280 and 7000 feet). 3-LED Display shows ambient CO2 value ( 7 ranges between 899 and 1601 PPM). Day / Night detection to turn off CO2 enrichment during the night. One-button calibration in fresh air ( 400 PPM). 5-Amps Output ( for CO2 burner valvue or regulator coil). ETL Listed

• INCLUDED MODULES AND ACCESSORIES One plug-in type module. One user guide One screw kit USER GUIDE, LAYOUTS AND APPLICATION NOTES