74347U Everything for early detection and warning of heat, smoke and fire in a complete fire alarm system. With the conveyance of single-source code compatibility and compliance. Edwards provides solutions like ionization and photoelectric smoke detectors. Manual single- and double-action pull stations. A complete line of synchronous strobes and combination signaling devices. Three five and ten zone control panels. 64 point and 254 point addressable control panels. Electromagnetic door holders and other fire alarm accessories.