Veris CW2XA2AV : Wall CO2/Humidity/Temperature/VOC Sensor, 24 VAC, 4 to 20 mA/0 to 5 V/0 to 10 V (Selectable), 0 to 2000/5000 ppm (Selectable), 2% RH Accuracy, Temperature Transmitter, 0 to 1000 ppb of Total VOC, High Impact ABS Plastic Enclosure, 5-Year Warranty