Blue Guard Innovations › UL 217 -Smoke Detector Master SA 521 Image 1 of 1 UL 217 -Smoke Detector Master SA 521 $65.00 On Backorder First Alert/BRK SA520/521 - Fire Only - Master with outputMaximum of one is recommended. Additional SA 511 are recommended to replace your existing smoke alarms.SA 520 User Manual On Backorder Added! First Alert/BRK SA520/521 - Fire Only - Master with outputMaximum of one is recommended. Additional SA 511 are recommended to replace your existing smoke alarms.SA 520 User Manual You Might Also Like Quick View Roving Watch Mate with Harness (BGWS-H8) $450.00 Quick View Roving Watchman & Fire Alarm System Kit (BGWS-RW1) $830.00 Quick View Alarm Watch Mate (BGWS-K9) $350.00 Quick View Honeywell System Sensor Hardwired Heat Detector (w/135°F Fixed Temperature) $55.00 Quick View UL 217 - Smoke & Carbon Monoxide SCO 500B $75.00
