First off, the 80dB alarm is NO joke. I accidentally triggered it while testing, and my cat bolted under the bed – that’s how loud it is. Perfect for sketchy hotel doors when traveling solo.

The adjustable jammer worked on my apartment’s uneven door gap, but my friend’s thicker door? Nope. Check your door clearance before buying – it’s not one-size-fits-all.

Battery life surprised me. Left it armed during a 2-week vacation, came back to blinking lights still working. Though one reviewer got dud batteries – maybe quality control issue?

Pro tip: The vibration sensor is sensitive enough to detect door jiggles but won’t go off from hallway foot traffic. Tested this during my neighbor’s loud party night.

That red casing? Looks like a toy but feels like tank material. Dropped it twice on tile – not even a scratch. Still, the plastic battery compartment feels flimsy compared to the metal body.