... 3) dB/M: 110/115/120dB Horn Siren for home alarm system Feature:DIY, Easy-to-operated ... farm, business store, public plaza security.Widely used for residential area, office, workshop, school, factor-y, ... Hospital.Widely used for bank, electric power Dept. Oil Dept, financial ... Dept.Police Dept etc Specitication:1.Working voltage: input: 110 VAC or 240VAC , Output :9~12VDC ...