{"product_id":"system-sensor-hcwl-lf-low-frequency-sounder-indoor-white","title":"System Sensor HCWL-LF Low Frequency Sounder Indoor White","description":"\u003cdiv\u003e\u003cp\u003eThe System Sensor HCWL-LF low-frequency indoor sounder (L-Series) delivers 520 Hz ±10% square-wave alerts for fire alarm and emergency notification systems, designed to reliably wake occupants in critical life-safety events. This ceiling-mounted, white indoor device runs on nominal 12\/24 VDC, uses a two-wire notification appliance circuit, and offers selectable high or low volume to tailor audibility for different spaces. Designed for hotels, hospitals, commercial buildings, and residential sleeping areas, it supports NFPA 72-compliant signaling and UL 464 requirements, making it suitable for evacuation networks and life-safety installations. It mounts to standard electrical back boxes and is commonly used for repair, retrofit, expansion, and replacement within System Sensor's L-Series, with common replacements including the HCRL-LF and HGWL-LF when upgrading or integrating with existing systems. As part of the L-Series, it integrates with other System Sensor notification components to support coordinated audible signaling during emergencies.\u003c\/p\u003e\u003c\/div\u003e","brand":"System","offers":[{"title":"New","offer_id":46253333938410,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/8039\/3450\/files\/GTG-STOCK-010.png?v=1788727428","url":"https:\/\/gtghardware.com\/products\/system-sensor-hcwl-lf-low-frequency-sounder-indoor-white","provider":"GTG Hardware","version":"1.0","type":"link"}