Edwards 877-P1 Horn Low-Current High Decibel DC Vibrating SF 02/01 and an external power supply

and an external power supply

and the initiating device loops share a common supervisory supply and ground

The wall-mount low-frequency sounder and low-frequency sounder strobes were designed to address the NFPA 72 sleeping space requirements that require a low-frequency notification appliance that operates within the frequency range of 520 Hz +/- 10% and is of a square wave tone

Replace with: Silent Knight SD505-PHOTO Addressable Photoelectric Smoke Detector

Edwards GCVWF Ceiling Horn strobe features a sleek low profile design

Edwards 877-P1 Horn Low-Current High Decibel DC Vibrating SF 02/01 and an external power supplyHorn Low Current High Decibel DC Vibrating