Safety Technology 2-in-1 Personal and Door Alarm 120dB – Dual-Function Burglar Deterrent and Portable Safety Alarm, Motion-Activated Door Knob Sensor, Pull-Chain Activation, 9V Battery Powered
$10.95
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One device, two functions. Hang it on a door knob and it sounds automatically when someone touches the handle. Carry it with you and pull the chain to trigger a 120-decibel alarm that draws attention to your location. Simple, battery-powered, and small enough to fit in a pocket or bag.
- 120dB alarm — louder than a car horn — audible from a significant distance
- Door alarm mode activates on contact with non-metallic door knobs
- Personal alarm mode triggers by pulling the attached metal chain
- Compact size: 4.25 x 2.25 x 1 inch, weighs just 0.23 lbs
- Runs on one standard 9-volt battery
Two Problems, One Device
A door alarm is useful when you’re sleeping in an unfamiliar room. A personal alarm is useful when you need to draw attention to yourself in a public space. Most products only handle one of those situations. This one handles both — which matters if you travel light or simply don’t want to carry multiple devices.
It’s not complicated technology. It’s a loud alarm with two activation methods in a pocket-sized package.
Who This Alarm Is For
Travelers who want a portable door alarm for hotel rooms, Airbnbs, or dorm rooms — especially when you can’t verify the quality of the locks. The door knob sensor adds a layer of awareness while you sleep without requiring installation or tools.
Anyone who walks, jogs, or commutes and wants a way to draw attention quickly. College students, night-shift workers, and elderly individuals who may not carry other safety tools often find a personal alarm practical because it requires no training, no aim, and no legal restrictions.
Is This the Right Choice for You?
Choose this 2-in-1 alarm if you want:
- A single device that works as both a portable personal alarm and a door alarm
- Something small and lightweight enough to travel with or carry daily
- No installation, no tools, no learning curve — hang it or pull the chain
Consider something else if you need:
- A door stop alarm that physically blocks the door from opening
- A personal alarm with a louder output or longer sustained duration
How Both Modes Work
In door alarm mode, you hang the device on a non-metallic door knob. The sensor detects vibration and movement — when someone touches or turns the handle, the 120dB alarm triggers immediately. This works on interior doors in hotels, dorms, apartments, and rental properties. It won’t work on metal door knobs because the sensor relies on detecting disturbance of the hanging device rather than electrical conductivity.
In personal alarm mode, you pull the attached metal chain and the alarm sounds at 120 decibels — roughly equivalent to a chainsaw at close range. The purpose isn’t to stop a threat directly. It’s to create noise that draws attention from anyone nearby, which changes the dynamic of most situations. The alarm continues as long as the chain is pulled, giving you sustained sound without needing to hold a button.
Both modes run on a single 9-volt battery, which means replacement is inexpensive and widely available at any convenience or hardware store.
Quick Comparison: How Does the 2-in-1 Alarm Stack Up?
| Feature | 2-in-1 Alarm | Door Stop Alarm | Keychain Alarm | Window Alarm |
|---|---|---|---|---|
| Volume | 120 dB ✓ | 120 dB ✓ | 120–140 dB ✓ | 100–110 dB |
| Door Protection | Yes — knob sensor | Yes — wedge block ✓ | No | No |
| Personal Carry | Yes ✓ | No | Yes ✓ | No |
| Physical Barrier | No | Yes ✓ | No | No |
| Dual Function | Yes ✓ | No | No | No |
| Best For | Travelers wanting both | Hotel room security | Daily carry | Home windows |
Practical Details
Dimensions: 4.25 x 2.25 x 1 inch. Weight: 0.23 lbs — lighter than most smartphones. Powered by one standard 9-volt battery (not included). The pull chain is attached and does not detach. Black housing. No installation required for either mode. The door knob function works on non-metallic knobs only — wood, plastic, or coated handles. Not effective on bare metal hardware.
A straightforward, dual-purpose alarm for people who want awareness and attention-drawing capability in a device small enough to forget it’s there — until you need it.
Frequently Asked Questions
Why doesn’t it work on metal door knobs?
The door alarm mode relies on detecting physical movement and vibration when the device is hanging on the knob. Metal knobs conduct less movement to the hanging unit and can interfere with the sensor. If your hotel or rental has metal door hardware, a door stop alarm placed at the base of the door may be a better option for that specific situation.
How long does the battery last?
Battery life depends on usage. In standby mode hanging on a door, a fresh 9-volt battery will last for weeks. The alarm only draws significant power when actively sounding. Carrying a spare 9-volt battery is inexpensive insurance — they’re available at any convenience store, gas station, or pharmacy.
Is 120 decibels actually loud enough to be useful?
120 decibels is roughly as loud as a chainsaw or a thunderclap at close range. It’s well above the pain threshold for most people and audible from several hundred feet away depending on the environment. The goal isn’t to incapacitate — it’s to create enough noise that people nearby notice something is wrong, which changes the situation.
| Decibles | 120 db |
|---|---|
| Battery | One 9 Volt |
| Color | Black |
| Included | Pull Chain |
| Weight | 0.23 lbs |
| Dimensions | 4 ¼" x 2 ¼" x 1" |
Additional information
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