Senva TGW-ACX-A : Wall CO Sensor/Controller, 0-200 ppm (default)/ 0-1000ppm (menu selectable), Analog Output, 4-20mA or 0-5/10V Output, Field Replaceable Sensing Elements, Standard LCD with Intuitive Set Up Menu, Integrated LED Indicators and Audible Alarm, 7-Year Warranty, Made in the USA