1.Smoke GAS CO detector 2.Independent alarm,easy install ... 5.AC 110V-240V /DC9V 115dB sound Description:1.GAS detector,Smoke detector,CO Detector,Scarbon monoxide detector,sending ... same time the product start to detector, when detect gas or smoke in air reach a certain density, ... less than 95%RHDetecting area: 20 square meter Detector Gas Density:2000PPM±30%Detector Smoke Density:1000PPM±30% Packing: ...