Local alarm

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Local alarm

Looking for a simple solution to intruders spending the night in somewhat hidden doorway lobby n an apartment building. What I'd like is a battery operated PIR for a small (12'x12' perhaps) that can be directly connected to a piezo or light or something - the idea being that motion in the area activates the device and chases the person out. Ideally, a sound file instead of a light or buzzer. Once the motion is gone, the alarm stops. Wiring would likely be an issue, so wireless is best. Any thoughts would be appreciated.