... broad 4.AC110-240V DC9V Battery Description:1.GAS detector,Smoke detector,CO Detector,Scarbon monoxide detector,sending wireless signal alarm ... time the product start to detector, when detect gas or smoke in air reach a certain density, began to alarm. Technical ... %RHDetecting area: 20 square meterDetector Gas Density:2000PPM±30%Detector Smoke Density:1000PPM±30% Packing:100pcs/Carton Size:48*60*25cm ...