Dwyer CDTV-2N404-LCD Carbon Dioxide Transmitter accurately measures CO2 levels from 0 to 2000 or 0 to 5000 ppm (model dependent) with an accuracy of ±40 ppm ±3% of reading. It operates on 16 to 35 VDC / 19 to 28 VAC power and has a response time of 2 minutes for CO2 and 5 minutes for VOC. The transmitter features a NEMA 4X enclosure rating and uses a single-beam, dual-wavelength NDIR sensor for CO2 and MEMS metal oxide semiconductor for VOC. It offers various output options including current, voltage, and relay, with a low power consumption of 2 watts on average.