... 5.AC 110V-240V /DC9V 115dB sound Description:1.GAS detector,Smoke detector,CO Detector,Scarbon monoxide detector,sending wireless ... design.6.Strong adaptability to circumstance.7.Easy install widely used for room,hall,kitchen,party,no smoking place,hotel,factory ... humidity: less than 95%RHDetecting area: 20 square meter Detector Gas Density:2000PPMĀ±30%Detector Smoke Density:1000PPMĀ±30% Packing:100pcs ...