ACI B5-O3-1P-O-X : Ozone Toxic MS/TP BACnet Gas Detection Transmitter, 0 - 1 PPM, -4 to 122 Deg F(-20 to 50 C), 5000 sq. ft (464.5 sq. m), 40 ft radius(12.2 m), Relay, LCD Display, 0.5 to 1.5' (0.15 to 0.46m) Below Ceiling Mounting Height, 2-Year Warranty, Made in USA