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|When you use the Portable Alarm System you are protected! It automatically emits a piercing sound when any of the doors or windows (of approximately a 5 room home) are opened, smashed or tampered with. Set it when you are NOT IN THE HOUSE... either when you are away or out in the back yard. The powerful siren will deter would-be intruders from entering your home, room or office. In short it works by detecting low-level subsonic vibrations (below the threshold of human hearing) created by the movement of air. (Read below for a more in-depth explanation). Unlike passive Infra-Red systems, the Portable Alarm System will NOT be activated by animal movement in a room. It can be hidden behind furniture or pictures to confuse an intruder. How It Works: The Portable Security Alarm is passive listening device; it does not transmit or emit radio waves or any kind of radiation. It is safe to use with animals and unlike other systems is not set off by animals. The Portable Security Alarm listens for inaudible low frequency sound waves associated with the opening or breaking of windows or doors. In nature some animals and mammals communicate using these infra sounds. PLEASE NOTE: It is ESSENTIAL that you read and follow the instructions. By following them you will have 100% satisfaction. If you don't, you will be frustrated.|