... sound Description:1.GAS detector,Smoke detector,CO Detector,Scarbon monoxide detector,sending wireless signal alarm independently.2.while detector density reach the limited, ... on, at the same time the product start to detector, when detect gas or smoke in air reach a ... than 95%RHDetecting area: 20 square meter Detector Gas Density:2000PPM±30%Detector Smoke Density:1000PPM±30% Packing:100pcs/Carton ...