2-in-1 Personal and Door Burglar Alarm 120dB – Doorknob Intruder Alert and Pull-Chain Personal Alarm, 9-Volt Battery, 4.25″ x 2.25″ x 1″ Compact Design

SKU: AL-2
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$10.95

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This alarm does two jobs with one device. Hang it on a door knob and it sounds automatically if someone touches the knob from outside — no setup, no arming sequence. Pull the chain and it works as a 120dB personal alarm. One device, two situations covered.

  • 120dB alarm — audible at distance and disorienting up close
  • Door knob mode: sounds automatically when knob is touched or moved
  • Personal alarm mode: pull the metal chain to activate
  • Compact at 4.25″ x 2.25″ x 1″, weighs 0.23 lbs
  • Requires one 9-volt battery (not included); chain included

One Alarm That Works on a Door Knob or in Your Hand

Most personal alarms do one thing. This one does two. Loop it over a hotel room door knob before you go to sleep and the 120dB alarm triggers automatically if anyone attempts to open or touch that knob from outside. Take it with you during the day and the pull-chain activates the same alarm on demand. The switch between modes requires nothing — just where you put it.

At 120dB, the alarm is loud enough to wake people in adjacent hotel rooms, startle an intruder into retreating, and draw attention in a public space. The mechanism is simple: touch the knob, the alarm sounds. Pull the chain, the alarm sounds.

Who This 2-in-1 Alarm Is For

Travelers who stay in hotels, motels, or Airbnbs without deadbolts they fully trust get the most use out of the door mode. Hang it on the interior knob before sleeping — if the door is opened from outside, you’ll hear it before anyone reaches the room. It’s a habit that takes five seconds to form and provides meaningful early warning.

The personal alarm function makes it useful beyond the room. People who walk alone, run at early hours, or work shifts that end late can carry it in a pocket or bag and pull the chain if a situation escalates. The dual function means it doesn’t sit unused in a drawer most of the time — it travels with you and works in more than one scenario.

Students, solo travelers, and people in ground-floor apartments or temporary housing tend to find the combination format practical in a way that either a door alarm or a personal alarm alone isn’t.

Is This the Right Choice for You?

Choose the 2-in-1 Personal and Burglar Alarm if you want:

  • Dual-function coverage — door protection at night, personal alarm during the day
  • No installation — hangs on any non-metallic door knob in seconds
  • A compact, affordable option that travels easily in a bag or luggage
  • Simple, automatic door activation that requires no arming or settings

Consider something else if you need:

  • Coverage for metallic door knobs — this unit is specified for non-metallic knobs
  • A door alarm that works without a knob (door stop alarms handle that use case)
  • Longer battery life expectations — 9-volt batteries should be replaced periodically

How the Dual-Mode Alarm Works

The door burglar mode works through vibration detection on the door knob. When the knob is touched or turned, the alarm triggers — no motion sensor aimed at the room, no pressure pad under the door. The alert happens at the point of contact, which gives you more time than a sensor that waits for someone to already be inside.

The personal alarm mode is a straightforward pull-chain design. The chain detaches to trigger the 120dB siren, which continues until the chain is re-inserted. That design means the alarm keeps sounding even if the unit is dropped or grabbed — the chain has to be reconnected to silence it.

Switching between modes requires nothing mechanical. Use it on the door knob at night. Drop it in a pocket or bag when you leave. The same device, the same battery, two distinct functions.

Quick Comparison: How Does the 2-in-1 Alarm Stack Up?

Feature 2-in-1 Door/Personal Alarm Door Stop Alarm Personal Alarm Only Window Alarm
Door Protection Yes ✓ Yes ✓ No No
Personal Carry Mode Yes ✓ No Yes ✓ No
Installation Required None ✓ None ✓ None ✓ Adhesive/mount
Activation Method Touch/vibration + pull chain Pressure/movement Pull pin or button Contact break
Decibels 120dB ✓ Typically 120dB ✓ 100–130dB Typically 100–110dB
Best For Travel + daily carry dual use Hotel door security Daily personal carry Window entry points

Practical Details

The alarm measures 4.25″ x 2.25″ x 1″ and weighs 0.23 lbs. Power comes from one 9-volt battery (not included — pick one up before travel). The pull chain is included. The unit is black and specified for non-metallic door knobs. No tools, adhesives, or modifications are needed for either mode of use.

At under a quarter pound, this alarm fits in any bag, works in any hotel room, and handles two of the most common personal safety situations without requiring anything extra.

Frequently Asked Questions

Why does it specify non-metallic door knobs?

The vibration-detection mechanism is calibrated for the resonance characteristics of non-metallic knobs — plastic and similar materials. Metallic knobs transmit vibration differently and may cause false triggers or reduced sensitivity. If your door has a metal knob, a door stop alarm placed at the base of the door is a more reliable option for that specific setup.

Will the door alarm go off if someone knocks on the door rather than touching the knob?

A firm knock on the door itself may or may not trigger the alarm depending on how much vibration transfers to the knob. The alarm is optimized for knob contact and movement rather than door surface impact. For hotel use, this generally works in your favor — the alarm responds to someone actually attempting to open or rattle the door rather than someone just knocking.

How do I silence the alarm after it activates?

In door knob mode, removing the alarm from the knob or moving it away from the vibration source will stop it. In personal alarm mode, re-inserting the pull chain into the unit silences the siren. Both methods are designed to be quick — you shouldn’t have to fumble to turn it off once the situation is resolved.

How long does the 9-volt battery last?

Battery life depends on how often the alarm activates. In standby mode on a door knob, a fresh 9-volt battery lasts through extended travel periods without issue. Replace the battery before any trip and check it periodically if the alarm is used at home regularly. A weak battery reduces alarm volume — testing before travel is a good habit.

Decibles120 db
BatteryOne 9 Volt
ColorBlack
IncludedPull Chain
Weight0.23 lbs
Dimensions4 ¼" x 2 ¼" x 1"

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