I recently installed this door/window alarm in my home, and it's been a surprisingly useful little device. The 120dB alarm is definitely loud enough to grab attention—when my toddler tried to sneak out the back door, the piercing sound made me drop everything and sprint to check. It’s not a smart home gadget, but for basic security, it does the job.

The installation was a breeze—just peel and stick. However, like others mentioned, the included adhesive isn’t the strongest. After a few days, I had to reinforce it with heavier-duty tape. The battery compartment is also a bit finicky; changing batteries feels like solving a tiny puzzle.

What I love most is the versatility. I’ve used it on doors, windows, and even my liquor cabinet (teenagers, am I right?). The different modes are handy—I use the 'doorbell' setting for my office door so I know when someone walks in. The 'closing reminder' beep has saved me from leaving the patio door open overnight more than once.

It’s not fancy—the plastic feels cheap, and there’s no app connectivity—but for under $20? It’s saved me from multiple potential disasters already. Just don’t mount it at ear level unless you enjoy temporary deafness.