1.Smoke GAS CO detector 2.Independent alarm,easy ... 110V-240V /DC9V 115dB sound Description:1.GAS detector,Smoke detector,CO Detector,Scarbon monoxide detector,sending wireless signal ... the product start to detector, when detect gas or smoke in air reach a certain density, began to alarm. ... 20 square meter Detector Gas Density:2000PPM±30%Detector Smoke Density:1000PPM±30% Packing:100pcs/Carton Size:48*60 ...