Senva CT1W-B3X : Recessed Wall CO2/Temperature Sensor, 0 - 2000 (Default) or 0 - 5000/10000 ppm (Selectable), 4-20mA/0-5VDC/0-10VDC Output, Temperature Transmitter, ABS Plastic Enclosure, Fitted Electrical Box and Hardware, 7-year Limited Warranty, Made in USA