... with Sound and Light Alarm, but also achieve site control.9.Double G 3/4" joint design, not only achieve ... 1.5W(DC24V)Detection principleCatalytic / Electrochemical /Infrared/PIDWorking voltageDC14V~35V( detector terminal)Communication modeHBUS Contact rating 2A/DC24V Install screw thread ... Detection Gas Combustible gas, VOC (Certain Organic Vapors),H2(ppm),CO,H2S,O2(VOL),NH3(ppm), Cl2,NO, CO2 Working ...