Black door knob touch alarm with its cord loop, on a soft grey background
Door Security

Door Knob Touch Alarm (120dB)

4.6 · 6 reviews

Hang it on the inside knob, and it sounds the moment a hand touches the handle.

$19.99One-time · free tracked shipping
Free tracked shipping Free 30-day returns 1-year warranty
  • A hand on the handle is enoughIt's a touch alarm. It sounds when a hand lands on the knob, before the latch turns and before the door opens. You hear the try, not the entry.
  • Hangs on, no toolsThe cord loops over the knob or lever and the alarm hangs flat against the door. No tape, no screws, nothing to peel off the paint later.
  • Small enough to travelIt's about 3.9 inches tall and runs on a 9V battery, so it fits a bag pocket for a hotel room, an Airbnb or a friend's spare room.
  • You decide when it's onA slide switch on the side turns it on at night and off in the morning, before you open the door yourself.
Door Knob Touch Alarm (120dB) $19.99

Why the handle

Every way through a door starts at the handle.

Before anyone tries a lock and before a door moves an inch, someone puts a hand on the knob. That's true even for a person with a key. A key opens the lock, but it doesn't open the door. The knob still has to turn.

A magnetic entry alarm waits for the door to open. A door stop alarm waits for the door to push against it. This one listens for the hand instead. Hang it from the inside knob, switch it on, and a touch on the handle sets off a 120dB siren while the door is still shut.

That makes it a tool for the hours you're inside: asleep in a new apartment, in a hotel room, in a rental where you don't know who else has a key. It doesn't stop a door from opening. It tells you someone is at the handle, loud enough that they know it too.

A key opens the lock. The knob still has to turn.
120dB
siren when the knob is touched
0tools
hangs on the knob by its cord
9Vbattery
behind a slide-off back cover
3.9in
tall, fits a bag pocket
Door knob touch alarm with labels for the 120dB siren, the on/off slide switch and the cord loop
Two jobs at one door

It warns. A lock holds.

This alarm doesn't hold a door shut, and it isn't meant to. Its job is the warning: a loud sound at the first touch, while you still have time to be awake and on your feet. Pair it with something that holds, like a portable travel lock or a door bar, and the same door both warns you and stays shut.

Because it hangs from the knob, it works on doors where you can't install anything: hotel doors, rental doors, a guest room at a relative's place. It comes off with the cord and leaves the door exactly as you found it.

No toolsRenter-friendlyTravel sizeOn/off switch
Setup

Hang it, switch it on, sleep

1

Put in the battery

Slide off the back cover, clip in a 9V battery and slide the cover back on.

2

Hang it on the inside knob

Loop the cord over the knob or lever on the inside of the door, so the alarm hangs against the door.

3

Switch it on

Shut the door, settle in, and slide the switch on the side to ON.

4

Test it once, then off before you open

Touch the handle once to hear it. In the morning, slide the switch to OFF before you reach for the handle yourself.

It's loud on purpose, so test it once at a sensible hour and tell anyone you share the room with. It's a touch sensor, so if your handle is plastic, rubber-coated or painted over, test it the day it arrives. If it stays quiet on your handle, send it back within 30 days.
Where it belongs

Doors you don't fully control

A new apartment where the lock may not have been changed. A hotel room off a long hallway. An Airbnb where the host, the cleaner and past guests may all have had a key or a code. These are doors you can't rekey or drill, and that's where a small alarm on the handle makes the most sense. It packs in a bag pocket and hangs on the knob in each new room.

Layer your defense

The handle is covered. Now the windows.

This alarm watches the door handle. The TremShield Alarm sticks to glass and sounds at 125dB when a window is pried or knocked on, before anyone is through it. If you have more than one window worth covering, the 6-pack is $99 for 6, $16.50 each.

See the 6-pack
White TremShield vibration sensor alarm
Good to know

Questions, answered calmly

It's a touch alarm. You hang it from the inside knob or lever by its cord and slide the switch to ON. When a hand touches the handle, it sounds a 120dB siren while the door is still shut. Slide the switch to OFF before you open the door yourself.

That's the job it's made for: a warning when someone tries the knob from the hallway. Doors and handles vary, so test it on your own door the first night. Switch it on, step outside, touch the outside knob and listen. If it stays quiet on your door, send it back within 30 days.

The cord loops over a round knob or a lever handle. It's a touch sensor, so a handle that's plastic, rubber-coated or painted over may not register a touch. Test it the day it arrives, and returns are open for 30 days if it doesn't work on your handle.

One 9V battery. It sits behind a slide-off cover on the back of the alarm. If you travel with it, keep a spare 9V in your bag.

Yes. It hangs from the knob by a cord, so nothing is stuck, screwed or drilled into the door. It's about 3.9 by 2.1 inches and 1 inch thick, small enough for a bag pocket. To take it off, lift the cord off the knob.

No. It's a warning, not a lock. It makes a loud sound when the handle is touched. To keep the door shut as well, pair it with a portable travel lock or a door bar on the same door.

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