System Sensor HCRL-LF-BP10 Low-Frequency SounderL Series low frequency sounders include a variety of features that increase their application versatility while simplifying installation. They are designed to address the NFPA 72 sleeping space requirements that require a low frequency notification appliance that operates within frequency range of 520 Hz 10% and is of a square wave tone. These devices feature plug in designs making installations fast and foolproof while virtually eliminating costly
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