First off, let me say these little alarms are LOUD. Like, 'wake-the-dead-and-scare-the-neighbors' loud. The 95 dB alarm isn’t joking around—when it goes off, you’ll know. I stuck one on my apartment door, and the first time my roommate came home late, the entire building probably heard it. Mission accomplished.

Installation is stupid easy. Peel, stick, pop in the batteries (FYI, they’re not included), and you’re set. No tools, no fuss. Though, fair warning: the adhesive isn’t winning any awards. One of mine slid off my window after a week, so I had to reinforce it with some heavy-duty tape. Not ideal, but for the price, I’ll take it.

Weird quirk? The alarm tones aren’t consistent. Some sound like a legit siren, others like a dying robot. It’s... charming? But hey, as long as it gets the job done. Perfect for renters, dorm rooms, or even a kid’s door (as one reviewer tested—brilliant). Just don’t expect James Bond-level precision.