“What does it do when it senses motion? Does it have an audible alarm?”

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• You need base unit . What you are looking at is a additional sensor. It can be added to base unit , up to 3 total when someone walks in front of base will sound. Hope this was useful.

  Answered by Kasey 6 years ago

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• yes, it has an audible alarm and lights so you can also see which alarm is sounding, which can have different sounds as well

  Answered by Markymark 6 years ago

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