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Honeywell's SpectrAlert Advance SP series speakers are dual voltage speakers designed for fire protective signaling systems. The SpectrAlert Advance series of notification appliances offers a wide range of outdoor speakers for wall and ceiling applications. They are designed to be used at either 25 or 70.7 V, and operate at any one for four input power levels. These products are electrically backward compatible with the previous generation of SpectrAlert speakers. With its low total harmonic distortion, the SpectrAlert Advance SP series offers high fidelity sound output.