1CE certificate 2Voltage can be custom. 3professional in this filed 17years Electric bell AC220V/DC24V)SpecificationModelLS-961-1Alarm sound≥85dBOperating current100mAOperating VoltageDC24/AC220VDimensionsΦ100MM /Φ150MMBasic InformationBusiness TypeManufacture Product/Service (We Sell)Detector series,horn series,flash lamp,burglarsystem,security accessory series,CCTV system