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System Sensor 4WT-B Four Wire Smoke Detector With Built-In Heat Sensor

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4 wire type smoke detectors are compatible with all alarm systems old and new, unlike the less popular 2 wire type. This model is the same as the 4w-b except...

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$38.90

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4 wire type smoke detectors are compatible with all alarm systems old and new, unlike the less popular 2 wire type. This model is the same as the 4w-b except it has a built in 135 degree heat sensor as well. We're often asked which type we recommend, 2 wire type or 4 wire type. If you are going to have only a few and they will all be on one level, we recommend 2 wire type. On the other hand if you will have smoke detectors on more than one level, will have more than a four or five, or you need them with built in sounders we then recommend the 4 wire type.

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