Negative Positive
Title: works well for a simple warning
Review: I bought this for my son who is newly married, living in an unsafe neighborhood, and afraid of someone entering his home. This device gives him the ability to sleep at night. As long as it is quiet, he knows no one is coming through the doors. It is not meant to replace full house protection, but serves its purpose well. I purchased two, and there was a slight problem with the battery connection on one which needed to be adjusted.
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