CDTV-2N404-LCD is a CDTV series carbon dioxide/volatile organic compound transmitter which reducesenergy cost in buildings by lowering the amount of conditioned air based on the occupancy of the space. By sensing both CO2 and VOC, the transmitter can detect fumes that may need to be exhausted during lower occupancy periods. It features single beam dual wavelength NDIR CO2 sensor allows for use in spaces that may be occupied 24 hours a day. Application includes HVAC applications in hospitals, schools, and commercial buildings, demand control ventilation, odor control, waiting rooms or other spaces that may be occupied 24 hours a day.