{"title":"Sounders","description":"\u003cp\u003eSounders are the audible half of fire alarm notification — the devices that produce the evacuation tone. They appear in conventional and addressable form, in wall and ceiling mount, and in indoor and weatherproof housings.\u003c\/p\u003e \u003cp\u003eTwo things drive selection. \u003cstrong\u003eSound output\u003c\/strong\u003e has to overcome the ambient noise of the space, so a plant floor needs a different device than an office corridor. \u003cstrong\u003eTone pattern\u003c\/strong\u003e matters for code compliance: many jurisdictions require a specific temporal pattern for evacuation, and some now require low-frequency output in sleeping areas because it wakes occupants more reliably.\u003c\/p\u003e \u003cp\u003eAddressable sounders draw power and control from the loop; conventional ones need a notification circuit sized for the total load. Check the panel's available current before adding devices to an existing circuit.\u003c\/p\u003e","products":[{"product_id":"system-sensor-hr-lf-low-frequency-sounder-2-wire-red","title":"System Sensor HR-LF Low Frequency Sounder 2-Wire Red","description":"\u003ch2\u003eThe Spectralert Advance System Sensor HR-LF is a red, two-wire, 12\/24 volt low-frequency sounder designed for wall or ceiling installation\u003c\/h2\u003e\n\u003cp\u003eIt is part of the Spectralert Advance series, which offers the most versatile and easy-to-use line of low-frequency sounders and strobes in the fire alarm industry.\u003c\/p\u003e","brand":"System Sensor","offers":[{"title":"Default Title","offer_id":43132770255072,"sku":"HR-LF","price":47.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0653\/7186\/5312\/products\/system-sensor-sounders-default-title-system-sensor-hr-lf-low-frequency-sounder-2-wire-red-31897173000416.jpg?v=1763278901"},{"product_id":"system-sensor-hrl-lf-low-frequency-sounder-2-wire-red","title":"System Sensor HRL-LF Low-Frequency Sounder 2-Wire Red","description":"\u003ch2\u003eSystem Sensor HRL-LF L-Series Indoor Selectable Output Low-Frequency Sounder, 2-Wire, Wall Mount, No Marking, Red (Replaces HR-LF)\u003cbr\u003e\n\u003c\/h2\u003e","brand":"System Sensor","offers":[{"title":"Default Title","offer_id":43132846211296,"sku":"HRL-LF","price":68.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0653\/7186\/5312\/products\/system-sensor-sounders-default-title-system-sensor-hrl-lf-low-frequency-sounder-2-wire-red-30833484693728.jpg?v=1763279818"},{"product_id":"system-sensor-hwl-lf-low-frequency-sounder-replaces-hw-lf","title":"System Sensor HWL-LF Low Frequency Sounder (Replaces HW-LF)","description":"\u003ch2\u003eSystem Sensor HWL-LF L-Series Indoor Selectable Output Low Frequency Sounder, 2-Wire, Wall Mount, no Marking, White, (Replaces HW-LF)\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"System Sensor","offers":[{"title":"Default Title","offer_id":43132846244064,"sku":"HWL-LF","price":59.4,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0653\/7186\/5312\/products\/system-sensor-sounders-default-title-system-sensor-hwl-lf-low-frequency-sounder-replaces-hw-lf-31897171624160.jpg?v=1763279805"},{"product_id":"system-sensor-hgrl-lf-indoor-low-frequency-compact-sounder","title":"System Sensor HGRL-LF Indoor Low Frequency Compact Sounder","description":"\u003ch2\u003eSystem Sensor HGRL-LF L-Series Indoor Low Frequency Compact Sounder, Plain, Wall Mount, Red\u003cbr\u003e\n\u003c\/h2\u003e","brand":"System Sensor","offers":[{"title":"Default Title","offer_id":43132846276832,"sku":"HGRL-LF","price":72.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0653\/7186\/5312\/files\/BK-HGRLLF_lg.jpg?v=1771877676"},{"product_id":"system-sensor-hgwl-lf-compact-low-frequency-sounder-white","title":"System Sensor HGWL-LF Low-Frequency Compact Sounder","description":"\u003ch2\u003eSystem Sensor HGWL-LF L-Series Indoor Low-Frequency Compact Sounder, 2-Wire, Wall Mount, White\u003c\/h2\u003e\n\u003cp\u003eThe System Sensor HGWL-LF is a compact low-frequency sounder from the L-Series, designed to provide dependable audible notification in sleeping areas and other indoor applications. Featuring a clean white housing and compact wall-mounted design, the HGWL-LF delivers a \u003cstrong\u003e520 Hz square wave tone\u003c\/strong\u003e that complies with \u003cstrong\u003eNFPA 72\u003c\/strong\u003e requirements for low-frequency occupant notification.\u003c\/p\u003e\n\u003cp\u003eEngineered for modern fire alarm systems, the HGWL-LF offers field-selectable tone settings, a plug-in design for quick installation, and a universal mounting plate with an onboard shorting spring that allows wiring continuity to be tested before the device is installed. Its compact size makes it an excellent choice where space is limited while maintaining the performance and reliability expected from the System Sensor L-Series.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eCompact indoor low-frequency sounder\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e2-wire wall-mounted design\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhite housing with no marking\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e520 Hz ±10% square wave tone\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eComplies with NFPA 72 sleeping area requirements\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eField-selectable High and Low output settings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTemporal 3, Temporal 4, Continuous, and Coded tone options\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePlug-in design for fast installation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUniversal mounting plate with onboard shorting spring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMinimal intrusion into the back box\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompatible with legacy SpectrAlert and SpectrAlert Advance devices\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompatible with the MDL3 Sync Module\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eModern compact L-Series design\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eGenuine System Sensor notification appliance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cp\u003eThe System Sensor HGWL-LF is ideal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eHotels and motels\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eApartment buildings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eStudent housing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHospitals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAssisted living facilities\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNursing homes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDormitories\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eResidential care facilities\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCommercial buildings requiring NFPA 72 compliant sleeping area notification\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eManufacturer: System Sensor\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eModel: HGWL-LF\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProduct Series: L-Series\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProduct Type: Compact Low-Frequency Sounder\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInstallation: Indoor\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMounting: Wall\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWiring: 2-wire\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHousing Color: White\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFrequency: 520 Hz ±10%\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTone Type: Square wave\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTone Settings: High\/Low, Temporal 3, Temporal 4, Continuous, and Coded\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOperating Voltage: Regulated 24VDC\/FWR\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMounting Plate: Universal with onboard shorting spring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompatibility: SpectrAlert, SpectrAlert Advance, and MDL3 Sync Module\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompliance: NFPA 72\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Choose the System Sensor HGWL-LF?\u003c\/h2\u003e\n\u003cp\u003eThe System Sensor HGWL-LF combines a compact design with powerful low-frequency audible notification to help meet modern fire alarm requirements for sleeping areas. 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