Series 65A Series 65A is a range of conventional fire detectors available in three versions: Standard Flashing LED Flashing LED and magnet operated test switch Series 65A Ionization Smoke DetectorSeries 65A Photo-Electric Smoke DetectorSeries 65A Heat DetectorSeries 65A Standard BaseSeries 65A Standard Relay Base 4"Series 65A Auxiliary Relay Base 4"Series 65A End-of-Line Relay BaseSeries 65A Low Profile Relay Base 6"Series 65A E-Z Fit Base 6"