Let me start by saying this little gadget packs a punch when it comes to sound. The 120db alarm is seriously loud - we're talking 'wake-the-dead' levels of noise when triggered. I tested it in my apartment and nearly gave my neighbor a heart attack!

The installation couldn't be simpler - just hang it on your door knob and you're good to go. The ABS plastic feels sturdy enough, though I did notice some slight creaking when handling it.

Now for the real test: does it work? In my experience, yes... but with some major caveats. The motion detection is sensitive (maybe too sensitive) - I've had false alarms from strong winds rattling my door. And like one reviewer mentioned, the battery life seems inconsistent - mine lasted about 3 months before needing replacement.

The biggest issue? Reliability. Several users report these alarms just stop working unexpectedly. Mine's still going after 4 months, but I'm keeping my fingers crossed.

Would I recommend it? As a temporary solution or for low-risk situations, sure. But if you need serious security, you might want to invest in something more dependable.