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Title: Loud and effective
Review: Makes a loud noise; would be heard throughout my house and would wake me if I was sleeping. Small enough to pack for motel trips. Gives some peace of mind.The battery compartment is closed by a screw. It takes one 9v battery (not included). The non-skid surface on the bottom may make it work like a door stop, at least slowing down someone trying to enter the room.
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