Secutron MRI-4003-LF 400 Series Low Frequency Sounder Base

Ensure reliable wake-up notification and code compliance where it matters most. The Secutron MRI-4003-LF low frequency sounder base is a purpose-built detector base that meets NFPA 72 requirements for sleeping areas, delivering a 520 Hz (+10%) low-frequency alarm tone proven to improve occupant response during emergencies. Designed for seamless integration with MRI-4000 series detectors, the base provides built-in sounding capability that eliminates separate horn devices, reducing cabinet space, wiring and installation time.

As a Secutron detector accessory, the MRI-4003-LF supports configurable operation to suit diverse security and fire monitoring applications across hotels, healthcare facilities, dormitories and multi-family housing. Its compact form factor and MRI-4000 compatibility make it ideal for system designers and installers seeking efficient, code-compliant solutions for life-safety and security monitoring. Specify the MRI-4003-LF sounder base to streamline installation and enhance emergency notification performance—add it to your next fire alarm or security system design.

• Ensures NFPA 72 compliance for sleeping areas with a low-frequency 520 Hz alarm that improves wake response
• Built-in sounder capability for MRI-4000 detectors reduces the need for separate horns and saves installation space
• MRI-4003-LF compatibility minimizes wiring and labor costs while simplifying system integration
• Configurable operation adapts to different life-safety layouts and monitoring requirements for flexible deployment
• Compact, cost-efficient detector base designed for reliable performance in hotels, healthcare, dormitories and other monitored facilities