Safety Technology Door Stop Alarm – 120dB Siren, Movement Tamper Sensor, Low Battery Indicator, One 9V Battery, 6.4″ x 1.75″ Wedge

SKU: ST-DSAL
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$7.95

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This one does two jobs at once — it wedges under a door to physically block it from opening, and if anyone pushes against it or tries to move it, a 120dB alarm goes off. Simple concept, works well. I've kept one in my travel bag for a couple years now. Hotel rooms, Airbnbs, anywhere the lock situation makes me a little uneasy.

  • 120dB alarm — loud enough to wake you up and draw attention from nearby rooms
  • Physical door block — the wedge shape creates resistance even before the alarm fires
  • Movement sensor — triggers if the unit is tampered with or shifted, not just pushed
  • Low battery indicator light — tells you when to swap before it matters
  • Compact size: 6.4" x 1.75" — fits in a travel bag, a coat pocket, a nightstand drawer

Two Layers of Security in One Small Wedge

A door stop alarm isn’t complicated. You slide it under the door, flip the on switch on the back, and go about your night. If someone pushes on that door — from outside, from the hallway, from wherever — the alarm sounds. And because it’s also a physical wedge, they’re not just tripping an alarm. They’re pushing against something that’s actively resisting.

That combination is what makes this useful. An alarm alone doesn’t slow anyone down. A wedge alone doesn’t alert you. This does both.

Who This Door Stop Alarm Is For

Travelers who stay in hotels, motels, or short-term rentals where you can’t always trust the lock situation. College students in dorms with shared hallways. People in ground-floor apartments or rooms with sliding doors. Anyone who wants a little more peace of mind at night without a permanent installation.

It also works well as a secondary alarm on a door that already has a lock — just extra insurance. Some people keep one on the back door at home for the same reason.

Is This the Right Choice for You?

Choose this Door Stop Alarm if you want:

  • Portable door security that works anywhere — no tools, no installation
  • A physical barrier and an audible alarm in one compact unit
  • Simple setup you don’t have to think about — on/off switch, that’s it

Consider something else if you need:

  • Security for outward-opening doors — wedge-style alarms only work on inward-opening doors
  • A full home security system with monitoring or camera capability

How It Actually Works

The wedge slides under the gap at the bottom of an inward-opening door. When someone pushes from the other side, the door presses down on the wedge and triggers the pressure sensor — setting off the 120dB siren. Release the pressure and the alarm stops. That automatic shutoff is a useful detail; it means you don’t need to fumble with a button when you’re half asleep and trying to figure out what’s happening.

The movement sensor adds another layer. If someone tries to reach under the door and slide the wedge out — or if it gets bumped or shifted — that also triggers the alarm. So it’s not just reacting to door pressure; it’s watching for tampering too.

The on/off switch is on the back of the unit. Low battery indicator light lets you know before the battery dies. Runs on a single 9-volt battery, which is not included but lasts a long time under normal use.

Quick Comparison: How Does the Door Stop Alarm Stack Up?

Feature Door Stop Alarm Window Alarm Motion Sensor Barking Dog Alarm
Physical Barrier Yes ✓ No No No
Audible Alarm 120dB ✓ Varies Varies Barking sound
Portable for Travel Yes ✓ Limited Some models Some models
Installation Required None ✓ Adhesive/magnet Mounting Plug-in
Works on All Doors Inward-opening only Yes ✓ Any entry ✓ Any area ✓
Best For Travel, hotel rooms Windows, sliding doors Room detection Perimeter deterrence

Practical Details

Dimensions: 6.4″ x 1.75″. Weight: 0.5 lbs. Power: one 9-volt battery (not included). Alarm level: 120dB. Features: pressure-activated alarm, tamper movement sensor, low battery indicator, on/off switch on back. Manufactured by Safety Technology. No mounting hardware or tools needed. Works on inward-opening doors only.

Eight bucks for something that blocks a door and screams if someone pushes it — it’s one of those things that’s worth having in the travel bag whether you ever need it or not.

Frequently Asked Questions

Does it work on all types of doors?

It works on inward-opening doors — the kind that swing toward you when you open them from inside. That covers most hotel rooms and bedroom doors. It won’t work on outward-opening doors or sliding doors, since the wedge needs door pressure to stay in place and trigger. For sliding doors, a window or sliding door alarm would be a better option.

How loud is 120dB really?

It’s comparable to a power saw or a loud rock concert at close range. Loud enough to wake you up from a deep sleep, loud enough to startle someone on the other side of the door, and loud enough that people in adjacent hotel rooms or down the hall will hear it. It’s not subtle. That’s the point.

Will it work on carpet or uneven floors?

It works best on hard flooring where the wedge can get solid contact and resistance. On thick carpet, the wedge may not create enough pressure to trigger reliably, and the door may not push down on it firmly. If your room has thick carpet, a window alarm or a secondary door alarm that attaches to the door frame may work better.

How do I turn it off once it’s triggered?

The alarm stops automatically when pressure is released from the door stop plate — so when the door stops pushing on it, the siren stops. You can also flip the on/off switch on the back of the unit. There’s no key or code required. The tamper movement sensor also deactivates when the unit stops moving.

ManufacturerSafety Technology
Decibles120 db
BatteryOne 9 Volt
Weight0.5 lbs
Dimensions6 3/8" x 1 ¾”

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