Fenwal PSD7155 Photoelectric Smoke Detector

NOTE: This part is discontinued by the manufacturer. Fenwal PSD7155 Photoelectric Smoke Detector is designed for both 2-wire and 4-wire operation with the proper compatible base. COMPATIBLE FENWAL DETECTOR BASES and ACCESSORIES: — 2-WIRE 2-W Base — 2WRLT 2-W Base w/ Remote LED & Test capabilities. — 2WRB 2-W base w/ 2WRM, Remote LED & Test capabilities. — 4WRB 4-W base w/ 4WRM, Remote LED & Test capabilities. — 2WRM SPDT Relay for 2WRB Bases. Contacts rated 1.0 A, 30 VDC / 0.5 A, 125 VAC. — 4WRM N/A Relay for 4WRB Bases. Contacts rated 1.0 A, 30 VDC / 0.5 A, 125 VAC. — MA-001 Mechanical Adapter allows CPD-705X & PSD-715X Detectors to physically connect to Base.