... -240V /DC9V 115dB sound Description:1.GAS detector,Smoke detector,CO Detector,Scarbon monoxide detector,sending wireless signal alarm independently.2.while ... install widely used for room,hall,kitchen,party,no smoking place,hotel,factory and so on. Instruction:Plug in ... than 95%RHDetecting area: 20 square meter Detector Gas Density:2000PPM±30%Detector Smoke Density:1000PPM±30% Packing:100pcs/Carton ...