Available in CO, H2S, NO2 and SO2, this Tango TX1 single-gas monitor features DualSense™ technology for increased safety and reliability. DualSense uses (2) of the same type sensors for detection of a single gas, virtually creating a backup system for the sensor. This allows bump testing to be determined by the user rather than a mandated schedule. In addition to an audible alarm of 100 dB at 10 cm, which can be increased by 10 dB with an optional AlarmAmp™, (3) strobe-emitting visual alarm LEDs (two red; one blue) and vibration alarm warn the user of dangerous conditions. The Tango TX1 single-gas monitor unit operates on (1) field-replaceable 3.6 V lithium-thionyl chloride battery designed to last three years in an always-on mode. Optional color nameplates allow the Tango TX1 to blend in with corporate surroundings. Guaranteed for Life. Color is safety orange. UL® (C-US) Class I, Groups A, B, C and D; Class II, Groups E, F and G; T4; Exia Class I, Zone 0, AEx ia IIC T4. Made in USA.