System Sensor HCRL-LF L-Series Indoor Low Frequency Sounder, Red

Improve occupant safety and simplify installation with the System Sensor HCRL-LF L-Series indoor low-frequency sounder. Designed to meet NFPA 72 sleeping-space requirements, this low-frequency sounder produces a 520 Hz ±10% square-wave tone that increases wakeability for sleeping or impaired occupants — a critical benefit for hospitals, dormitories and assisted-living facilities. The red, indoor-rated unit supports both wall and ceiling mounting and features a plug-in design with minimal back-box intrusion to reduce installation time and eliminate many common ground-fault issues. A universal mounting plate with an onboard shorting spring enables pre-installation continuity testing and protects devices during construction. Electrically compatible with legacy SpectrAlert and SpectrAlert Advance devices and supporting MDL3 synchronization, the HCRL-LF integrates easily into existing security, fire monitoring and surveillance systems. Choose this reliable, code-compliant sounder to streamline upgrades and improve alarm performance — ideal for commercial, institutional and multi-family applications. Contact us to specify the HCRL-LF for your next project or add it to your system build.

• Meets NFPA 72 sleeping-space requirements with a 520 Hz ±10% square-wave tone to improve wakeability and occupant safety
• Plug-in design and minimal back-box intrusion speed installations, reduce costly ground faults, and simplify maintenance
• Universal mounting plate with onboard shorting spring lets installers test wiring continuity and protects devices during construction
• Listed for wall and ceiling use and finished in high-visibility red for easy identification in indoor security and fire notification systems
• Backwards-compatible with legacy SpectrAlert devices and supports synchronization (MDL3) for seamless system upgrades and integration