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|Features built-in thermal heat sensor -- for more accurately detecting a wide range of fires (135 degree F heat detector). The Napco Firewolf 2 Wire smoke detector more accurately detects all types of fire including: paper, wood, gasoline, polystyrene, smoldering fires, etc. for performance superior to previous photoelectric detectors. This very attractive, low profile, baseless unit utilizes dual LEDs for 360 degree visability (with flashing cleansing indicator). It's patented innovative chamber design significantly reduces unwanted chamber reflections, so that the light source is pure and extremely focused. This combination of superior chamber and photoelectric beam design enables precision detection of even minute particles, as produced by clean-burning fires. NPFW2H|