STEP 01
Wedge it under the door
Push the wedge under the closed door until it is snug against the floor. It works on any inward-opening door with a hard floor or short carpet underneath.
Built for doors you don't control
You can't change the lock.
You can't change the lock.
You can hear it open.
A 120 dB alarm inside a steel door wedge. Slide it under the door, flip the switch, and anything that pushes the door sets it off. Hotel rooms, Airbnbs, share houses, dorms - anywhere a key exists that isn't yours.
$13.81
for the 2-pack · $6.90 per alarm
- 120 dB siren triggered by pressure on the door
- Three sensitivity levels for light and heavy doors
- No drilling, no adhesive, nothing left behind
- Two units per pack - one for home, one for the bag
120dB
Siren on contactLoud enough to wake the floor
Armed in secondsNo tools. No wiring. No marks.
How it works
Three seconds to set. No permission needed.
A hotel door, a rental, a room in a share house - you don't get to fit a bolt, and you often don't know how many keys exist. A wedge alarm is the one thing you can add to a door that isn't yours and take with you when you leave.
STEP 02
Flip it on, pick a sensitivity
One switch arms the alarm; a second sets high, medium or low. Low for a heavy apartment door that rattles, high for a light hotel door that barely moves.
STEP 03
The door moves, the siren goes
Pressure on the wedge trips the vibration sensor and a 120 dB siren fires. Switch it off to silence it, switch it back on to re-arm. No reset, no app, no code.
It also works as an ordinary door stop with the alarm switched off. Each unit runs on one 9V battery, which is not included in the pack.
Where to use it
One wedge, a lot of doors
It fits any inward-opening door over a floor it can grip. That covers most of the places people feel least in control of a door.
Hotels & Airbnbs
Housekeeping, maintenance, the last guest, the owner - a lot of people can open that door. The wedge takes ten seconds and leaves no trace on the frame.
Solo travel
The point isn't stopping the door - it's never being the person a stranger opens a door on quietly. Small, flat, and packs in a carry-on.
Apartments & rentals
You can't change the locks, and you don't know who held a key before you. Add an alarm you're allowed to add, and take it with you at the end of the lease.
Dorms & share houses
Shared hallways, a door that doesn't lock properly, housemates' friends you've never met. One wedge on the bedroom door at night.
Working or sleeping alone
A back office after hours, a night shift, a caravan, a hotel room on a work trip. Anywhere being alerted matters more than being locked in.
Anti-theft at home
Back doors, side doors, sliding patio doors and garage internal doors - the entries a burglar prefers because nobody's watching them.
Emergency kit
No power, no signal and no network needed - it runs on a 9V battery for about a year. A sensible thing to have in a go-bag or a spare room.
Family & older relatives
Nothing to learn, nothing to charge, nothing to pair. Two switches and a battery - which is why it tends to actually get used.
Specifications
Everything, in plain numbers
- Alarm volume
- 120 dB
- Trigger
- Vibration / pressure sensor in the wedge
- Sensitivity
- Three levels - high, medium, low
- Power
- One 9V battery per unit (not included)
- Battery life
- Approximately one year in normal standby
- Body
- Stainless steel cover, silver and black
- Dimensions
- 135 × 45 × 40 mm per unit
- Net weight
- 294 g for the 2-pack
- Installation
- None - nothing is fixed to the door or frame
- In the box
- 2 × door wedge alarm
Be clear on what it is
- An alarm that makes an entry loud, fast and public
- Physical resistance from the wedge itself
- Portable, reusable and completely non-destructive
- Not a lock, and not a replacement for a deadbolt
- Not a monitored system - nobody is alerted but you
- Won't work on outward-opening doors or deep pile carpet
Batteries are not included. Each unit needs one 9V battery, so grab two before your trip. Fire safety note: never wedge a door in a way that stops you getting out.
See the product page
Compared
Against the other things people try
Most portable door security either blocks the door or alerts you. A wedge alarm is one of the few that does a bit of both - which is the honest reason to pick it.
| Wedge alarm | Portable door lock | Door chain / latch | Chair under the handle | |
|---|---|---|---|---|
| Wakes you up | Yes - 120 dB | No | No | No |
| Physically resists the door | Yes | Yes | Yes | Somewhat |
| Needs fitting to the door | No | No | Yes - screws | No |
| Works in a hotel or rental | Yes | Usually | No | Yes |
| Alerts neighbours or the hallway | Yes | No | No | No |
| Fits in a carry-on | Yes | Yes | No | No |
| Needs a battery | Yes - 9V | No | No | No |
A wedge alarm pairs well with a portable lock rather than replacing it. If you already travel with one, the alarm is what adds the noise.
Questions
The things people ask before buying
How loud is 120 dB, really?
About the level of a chainsaw or an ambulance siren heard up close. Inside a hotel room or a bedroom it is genuinely startling, and it carries into a hallway. It is designed to be unpleasant enough that someone lets go of the door.
Will it work on my door?
It needs a door that opens inwards, over a floor the wedge can bite into - tile, timber, vinyl, concrete or short carpet all work. It will not work on an outward-opening door, and it grips poorly on deep pile carpet or a very uneven threshold.
Does it need batteries?
Yes - one 9V battery per unit, so two for the pack. Batteries are not included, because they cannot be shipped with every order. A battery lasts roughly a year on standby.
Will it damage the door or the floor?
No. Nothing is screwed, glued or taped. The wedge sits on the floor and presses against the bottom of the door, so there is nothing to leave behind and nothing that puts a rental deposit at risk.
Can I use it as a normal door stop?
Yes. Turn the alarm switch off and it is just a heavy steel wedge holding a door open. That is useful when you are carrying things in and out.
Is it allowed in hotels and Airbnbs?
It fits no hardware and modifies nothing, so it is generally fine where a door stop is fine. Check the rules where you are staying, and never block a door in a way that would stop you escaping in a fire.
What stops it going off by accident?
The sensitivity switch. Set it low on a door that rattles in the wind or gets knocked, and high on a light door that would otherwise open too quietly to trigger it. Test the setting once before you rely on it.
Can I take it on a plane?
It is a small steel wedge with a battery-powered buzzer, so it normally travels fine in carry-on or checked luggage. Rules differ by airline and country, so check yours - and pack the batteries according to your airline's battery policy.
Why two in a pack?
Most people want one that stays at home on a back or bedroom door, and one that lives in a suitcase. A single unit also covers only one door, and most rooms worth alarming have exactly one.
Two alarms, two doors
Hear the door before you see it.
Ten seconds to set, nothing to install, and nothing left behind when you check out. Remember to pick up two 9V batteries - they aren't in the box.
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