Safety Technology Door Stop Alarm with 120dB Siren – Wedge Block, Movement Sensor, Low Battery Indicator, One 9-Volt Battery, 6.375 x 1.75 Inches

SKU: ST-DSAL
Categories: ,

$7.95

Buy with Confidence
Covered by a 30-Day Money Back Guarantee. If it's not right for you, returns are easy and hassle-free.

Secure Checkout - Satisfaction Guaranteed - Money Back Guarantee

Secure checkout • 100% Satisfaction Guaranteed • 30 Day Money Back Guarantee • Easy Returns • Fast Customer Support

Picked one of these up after a trip where the hotel door lock felt a little flimsy. Slides under the door, and if anyone tries to push it open, you get a 120dB alarm that’s going to wake up the whole floor. There’s also a movement sensor built in so it’ll go off if someone messes with it while it’s set. Simple, cheap, and actually works.

  • 120dB alarm – loud enough to be heard through walls and down a hallway
  • Dual-trigger design – activates from door pressure or from being tampered with
  • Physical door block – the wedge slows entry even before the alarm goes off
  • Low battery indicator – tells you when it’s time to swap the 9-volt
  • Compact and portable – 6 3/8″ x 1 3/4″, weighs half a pound, fits in any bag

Two Jobs in One Small Package

Most door alarms just make noise. This one also physically resists the door opening — the wedge digs in under pressure, which buys a few extra seconds on top of the 120dB alarm going off. For hotel rooms, dorm rooms, or anywhere the lock situation is less than ideal, that combination is pretty useful.

The movement sensor is a nice touch. If someone tries to quietly slide it out of the way before opening the door, the alarm still triggers. So it’s not easy to defeat just by knowing it’s there.

Who This Door Stop Alarm Is For

Travelers are the obvious ones — people who stay in hotels or Airbnbs and don’t love trusting a door chain they didn’t install. It takes about ten seconds to set up and nothing to install, so it’s easy to throw in a bag and use wherever you land.

College students in dorms are another good fit. Same idea — you didn’t pick the lock, you don’t fully control who has a key, and you’re probably sleeping alone sometimes. This is a ten-dollar fix for that.

It also works fine at home. A lot of people keep one on the bedroom door at night or use it on a back door that doesn’t get used much. Nothing fancy, just a simple extra layer.

Is This the Right Choice for You?

Choose this door stop alarm if you want:

  • A portable door security option that requires zero installation
  • Both a physical barrier and a loud alarm in one device
  • Something affordable and simple for travel, dorms, or home use

Consider something else if you need:

  • Permanent home security with remote monitoring or app integration
  • Protection for windows or sliding doors — this is door-specific

How It Actually Works

The wedge slides under the door and sits on the floor plate. When the door gets pushed inward, it presses down on the alarm unit, which triggers the 120dB siren. At that volume, you’re talking about something close to a smoke alarm or power saw — definitely not something anyone is going to sleep through.

The movement sensor adds a second layer. Even if the pressure trigger isn’t engaged yet, jostling or lifting the unit will set it off. The on/off switch is on the back of the unit, and there’s a low battery indicator so you’re not caught off guard with a dead alarm. Runs on a single 9-volt battery, which isn’t included but is easy enough to grab anywhere.

The whole thing weighs half a pound and measures about 6 and a half inches long, so it slides into a laptop bag or a carry-on without taking up much room.

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

Feature Door Stop Alarm Window/Door Sensor Alarm Motion Sensor Alarm Barking Dog Alarm
Physical barrier Yes ✓ No No No
Alarm volume 120dB ✓ Varies Varies Realistic bark
No installation needed Yes ✓ Yes ✓ Yes ✓ Yes ✓
Works on travel doors Yes ✓ Limited Limited Yes
Tamper detection Yes ✓ No Yes Yes
Best For Travel, dorms, bedrooms Windows, door perimeter Room detection Deterrence before entry

Practical Details

Dimensions are 6 3/8″ x 1 3/4″. Weighs 0.5 lbs. Runs on one 9-volt battery, not included. No installation required — just place and set. Low battery indicator light on the unit. On/off switch on the back. From Safety Technology, which has been making personal safety products since 1986.

Simple to use, nothing to install, and loud enough to matter — a solid door security option for travel or home use.

Frequently Asked Questions

Will this work on carpet?

It works best on hard floors where the wedge can grip firmly. On carpet, there’s some grip, but thick pile carpet may reduce how well the wedge holds. A lot of people use it successfully on low-pile carpet — just test it in your space first to make sure it’s sitting flush and making solid contact with the door.

How long does the battery last?

A 9-volt battery in standby should last a year or more under normal use. The low battery indicator light will let you know when it’s getting low so you’re not caught with a dead unit. Worth keeping a spare 9-volt around, just like you would for a smoke detector.

Can I use this in a hotel room?

That’s basically what it was made for. Slide it under the door before you go to sleep, flip the switch on, and you’re set. Nothing to attach to the wall, no tools, no damage to the room. Just pull it out when you check out and toss it in your bag.

Does it stop the door from opening completely?

It adds real physical resistance — the wedge digs in as pressure is applied — but it’s not a deadbolt. It slows entry and buys time while the alarm is going. The combination of physical resistance plus a 120dB siren is the point. Think of it as a delay and alert system, not a barricade.

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

Additional information

Related products