Catalog > Consumer Electronics > Security & Alarms > Alarms > Alarm Systems Optical S65 - DP652 Smoke Detector Optical S65 - DP652 Smoke Detector FR19 Smoke Detector - Optical S65 - DP652 , 9-33VDC Discontinued Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Features Optical technology 9 to 33vDC Use with FR23 standard or FR23-1 relay base Conventional 2 wire