System Sensor HCWL-LF L-Series Indoor Selectable Output Low Frequency Sounder, 2-Wire, Ceiling Mount, no Marking, White

Designed for clear, code-compliant audible notification in life-safety and security environments, the System Sensor HCWL-LF low frequency sounder provides dependable alarm signaling where occupant wakeability is critical. This 2‑wire, ceiling-mount low frequency sounder meets NFPA 72 sleeping-space requirements with a 520 Hz ±10% square-wave tone and supports regulated 24 V DC operation for stable performance in monitored alarm systems. Installers benefit from the plug-in design and universal mounting plate with onboard shorting spring, which simplify wiring checks and cut installation time while minimizing ground faults. The rotary tone selector and electrical compatibility with legacy SpectrAlert and SpectrAlert Advance devices make the HCWL-LF a flexible choice for retrofit or new-construction projects. Ideal for security, surveillance and building monitoring applications, this unobtrusive white unit integrates into emergency notification and alarm systems to enhance occupant safety. Specify the HCWL-LF for reliable, code-ready audible notification — order today or contact us to include it in your next life-safety or security project.

• Ensures NFPA-compliant sleeping-space notification with a 520 Hz ±10% square-wave tone for improved wake capability
• Simple, time-saving plug-in 2‑wire design and universal mounting plate with shorting spring speeds installation and reduces callbacks
• Reliable 24 V DC operation and rotary tone settings deliver consistent alarm performance for life-safety and security systems
• Ceiling-mount form factor and compatibility with legacy SpectrAlert/Advance devices and MDL3 sync module for easy system upgrades
• Low-profile white housing resists construction damage and integrates cleanly into surveillance, monitoring and alarm installations