Estes | Do The Security Camera's Have Ears Too?

Just wondering if the camera's have the ears to listen to our conversations?
A friend of mine was almost in a wreck.. He called safety the next day. Had me on 3 way listening in on the conversation.. His question was, "could you rewind back before he pushed the record button leading up to the min he touched the record? " he said safety can but nobody else can because they have a different setup. Anyhow, he rewound back before the near accident and you could hear the air horn in the video
 
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