System Sensor HWL-LF L-Series Indoor 2-Wire Selectable Output Low Frequency Sounder, Wall Mount, No Marking, White

Deliver reliable, code-compliant audible notification where it matters most — sleeping areas and high-risk occupants. The System Sensor HWL-LF L-Series indoor 2-wire selectable output low frequency sounder provides NFPA 72-approved low-frequency (520 Hz ±10% square wave) alerts that improve chances of waking sleeping occupants while integrating seamlessly into existing alarm and monitoring networks. Designed for installers and facility managers, this wall-mount unit accepts 33V DC power, features a plug-in design that limits backbox intrusion, and includes a universal mounting plate with an onboard shorting spring so wiring continuity can be tested before the device is seated. The selectable output options let you optimize current draw for a variety of panel and circuit requirements, reducing field rework and labor time. Built to work with legacy SpectrAlert products and MDL3 sync modules, the HWL-LF lowers upgrade costs and simplifies system expansion for security, surveillance, and life-safety applications. Specify this System Sensor low-frequency sounder for dependable notification and faster installs — ideal for healthcare, multi-family, and institutional projects. Order now to streamline your next alarm system deployment.

• Ensures occupant safety with NFPA-compliant 520 Hz ±10% low-frequency square wave tone for effective sleep‑space notification
• Two-wire selectable output and 33V DC power compatibility reduce wiring complexity and lower installation costs
• Plug-in design with minimal backbox intrusion and universal mounting plate speeds commissioning and minimizes ground faults
• Onboard shorting spring lets installers verify wiring continuity before final installation, protecting devices from construction damage
• Backwards compatibility with SpectrAlert/SpectrAlert Advance and MDL3 sync module simplifies upgrades and system integration