Magnetic Door-Window Alarm 2-Pack, 90 dB Entry Alert Siren, Magnetic Contact Sensor, Adhesive Install, No Wiring, Battery Included, Renter-Friendly Home & Apartment Security

You hear it every time you move into a new place: check the locks, check the windows, hope for the best. But hoping isn’t a security plan. If you rent your apartment, share a house, or just want to know the second someone opens a door or window they shouldn’t, you need something that works immediately—not something that requires a contractor.

Who This Is Best For: Renters who can’t drill into walls or wire a system. College students in dorms or shared housing. Parents who want to know if a kid’s window opens after curfew. Anyone in an apartment, condo, or short-term rental who needs real entry alerts without a lease violation.

Is This Right For You? If you’ve been putting off home security because every option seems to involve contracts, installers, or holes in your walls, this solves that problem directly. Stick it on, arm it, done. If you need whole-house monitoring with a monthly fee and a control panel, look elsewhere—this is a straightforward, no-nonsense entry alert for specific doors and windows.

Key Features & Benefits

• 90 dB siren — loud enough to startle an intruder and alert you or neighbors, comparable to a gas-powered lawn mower up close
• Magnetic contact sensor — separates when the door or window opens, triggering the alarm instantly, no delay
• Adhesive mount — 3M-style backing means no drilling, no screws, no damage deposit risk
• Battery operated, batteries included — works right out of the box, no waiting on a charger or hunting for the right size battery
• 2-pack — cover two entry points, like a front door and a bedroom window, or double up on a sliding door
• On/off switch — arm it when you leave or sleep, disarm it when you’re home and moving through the space

Comparison: Door/Window Alarm vs. Alternatives

Practical Details

Legal in all 50 states—no restrictions on personal alarm devices. Check that your lease allows adhesive mounts, though most 3M-style backings remove cleanly without residue. Replace batteries when the alarm’s test tone weakens; a spare set is a smart thing to keep on hand. Each unit in the box includes the alarm, the magnetic sensor piece, adhesive strips, and batteries—nothing else to buy.

You don’t need a home security overhaul to know when someone’s coming through a door they shouldn’t. Add this to your cart, put one on your front door and one on a vulnerable window, and get back to feeling settled in your own space.

FAQ

Will this work on sliding glass doors?
Yes. Mount one half of the sensor on the fixed frame and the other on the sliding panel, keeping them aligned when closed. The magnetic gap needs to stay within about half an inch for reliable triggering, so test it after installation.

How loud is 90 dB really?
It’s loud—comparable to a motorcycle engine or a gas lawn mower from a few feet away. It’s designed to startle an intruder and alert anyone nearby, including neighbors through a shared wall or hallway.

Will the adhesive damage my paint or door finish?
The mounting strips are designed for clean removal, but always test on an inconspicuous spot first, especially on older paint or wallpaper. If you’re concerned, most hardware stores carry damage-free mounting alternatives that work with the same sensor.

Do I need to replace the batteries often?
Not typically. These run on standard batteries with a long standby life since they’re only active when triggered. Test the unit monthly and swap batteries at the first sign of a weak alarm tone.