Smoke Detectors and Fire Alarms DSC, Fire Safety, Safety & Security, Tools & Home Improvement DSC FSA-410BST Wired Photoelectric Smoke Detector (4-Wire with INT Sounder and Heat Detector) Review by CheatingMutant June 25, 2018 No Comments DSC FSA-410BST wired photoelectric smoke detector (4-wire with into sounder color and heat detector), product Type – smoke detector, made in Czech Republic, manufactured by DSC.