At first glance, this 120dB door alarm seems like a straightforward security device - until you discover its secret potential in ghost hunting! The loud alarm certainly delivers on its promise, with an ear-piercing siren that would scare away any intruder (or restless spirit).

The ABS construction feels surprisingly durable in hand, though one reviewer mentioned theirs stopped working after falling off the door. Installation couldn't be simpler - just hang it on any doorknob and flip the switch. No wires, no fuss.

What really surprised me was discovering how popular these are among paranormal investigators! With some simple modifications (adding an antenna, volume control knob, and LED indicator), these transform into excellent motion sensors for ghost hunts. The basic design makes them perfect for customization.

For home security purposes, it works great out of the box. The alarm is loud enough to wake the whole neighborhood if someone tries to enter unexpectedly. I've used mine on both doors and windows when traveling - gives me peace of mind in hotels.

Just be warned - if you're using it as intended (not for ghost hunting), make sure it's securely mounted. That loud alarm won't do any good if it falls off at the wrong moment!