System Sensor HGWL-LF L-Series Indoor Low Frequency Compact Sounder, 2-Wire, Wall Mount, White

Designed to deliver reliable, code-compliant audible notification where it matters most, the System Sensor HGWL-LF L-Series low frequency compact sounder provides NFPA 72-compliant 520 Hz ±10% square-wave tones specifically for sleeping areas and other life-safety applications. This 2‑wire, wall-mount audible device accepts 33V DC and uses a plug-in design with minimal backbox intrusion, making installation faster and reducing costly wiring faults. The HGWL-LF’s universal mounting plate with an onboard shorting spring lets technicians verify continuity before device placement, protecting equipment during construction and streamlining commissioning.

Ideal for security, surveillance and building monitoring projects, this compact sounder is electrically compatible with legacy SpectrAlert lines and supports synchronized notification with MDL3 modules, simplifying upgrades and integrations. Its modern white housing blends into commercial, healthcare, education and hospitality environments while delivering powerful, low-frequency alerts. Specify the HGWL-LF for dependable audible alarm performance — contact your sales rep to include it in your next security or life-safety installation.

• NFPA-compliant low-frequency notification (520 Hz ±10%) designed to wake sleeping occupants and improve life-safety response
• Compact 2‑wire wall-mount design and plug-in connector minimize backbox intrusion for faster, cleaner installations
• Universal mounting plate with shorting spring allows wiring continuity checks and protects devices during construction
• Electrically compatible with legacy SpectrAlert/SpectrAlert Advance systems for simple retrofits and system upgrades
• Durable white housing and modern aesthetics provide a discreet, professional appearance for security and monitoring environments