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Will the 5800PIR-OD get set off by animals outside?

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This motion detector is made especially for outside applications. This means that it will immune to small to medium animals. The detector use a size of heat signature detedction method that excludes animals of a certain weight class.

Mount these high up to reduce risk of false activations. These will still detect a human-sized heat signature so there are no worries that it won't work as intended.