Here’s a scenario every college student and solo traveler faces: you’re in a dorm room or hotel, and the door lock doesn’t exactly inspire confidence. Or you’re walking across campus late at night with your keys in one hand and your phone in the other, and someone’s following too close for comfort. What you need is something that works both ways—protection when you’re stationary and protection when you’re moving. That’s exactly what this 2-in-1 alarm delivers.
Who This Alarm Is Best For:
- College students living in dorms with flimsy locks and close neighbors
- Business travelers staying in hotels who want extra door security
- Anyone who walks alone and needs a personal panic button that’s easy to activate
- Elderly parents or grandparents who need both home security and mobile protection
Is This the Right Alarm for You?
Choose the 2n1 Personal & Burglar Alarm if you want:
- Dual functionality—door security when you sleep, personal alarm when you walk
- Instant activation that requires zero thinking in an emergency situation
- Loud enough to wake neighbors and alert everyone within 300 feet
Key Features: The door alarm function uses a magnetic sensor that hangs over any non-metallic doorknob. When someone grabs the knob from either side, the magnetic field breaks and the 120-decibel alarm activates immediately. There’s no installation, no tools, no adhesive—just hang it on the inside knob before you go to bed or step into the shower. The alarm is loud enough to be heard through walls and doors, alerting neighbors and scaring off intruders who don’t want attention. We’re talking about the same volume as a chainsaw at full throttle—nobody’s sneaking in quietly with this thing screaming.
For personal carry, you simply grab the metal chain and pull it out of the device. The 120-decibel siren activates instantly, and you keep pulling until help arrives or the threat backs off. It’s easier than fumbling for pepper spray and more effective than yelling for help—sound travels, and this alarm can be heard from over 300 feet away. The compact size (4.25″ x 2.25″ x 1″) means it fits in your pocket, purse, or clipped to your backpack. Runs on a single 9-volt battery (included), and battery life is 6-8 months with normal use. The black housing is durable ABS plastic that can take a beating.
Quick Comparison: How Does This Alarm Stack Up?
| Feature | 2n1 Alarm | Door Wedge Alarm | Keychain Alarm | Motion Alarm |
|---|---|---|---|---|
| Portable | Yes ✓ | Bulky | Yes ✓ | No |
| Door Security | Yes ✓ | Yes ✓ | No | Yes |
| Personal Alarm | Yes ✓ | No | Yes ✓ | No |
| Volume | 120 dB ✓ | 120 dB ✓ | 90-110 dB | 110 dB |
| Best For | Dual use flexibility | Permanent door use | Carry only | Stationary security |
Practical Details: The unit weighs just 0.23 lbs including battery, making it one of the lightest dual-function alarms on the market. The pull chain is connected by a sturdy cord that won’t break under panic-level force. Works on wood, plastic, and painted doorknobs—the magnetic sensor won’t function on metal knobs, so test it on your specific door before relying on it. The on/off switch prevents accidental activation when the device is in your bag. Battery replacement is simple: pop off the back cover with a coin, swap in a fresh 9-volt, and you’re back in business. ThugBusters has been selling these to college students and hotel travelers for over 15 years because they’re simple, reliable, and surprisingly effective at making noise.
Hang it on your door at night. Carry it during the day. Be Prepared and Be Safe!
Frequently Asked Questions
How does the door alarm actually work if I’m not touching it?
Good question—it’s magnetic, not motion-based. Inside the device is a magnetic sensor. When you hang it over your doorknob, that sensor creates a magnetic field. The second someone grabs the knob from outside (or inside), they disrupt that field and the alarm triggers. It’s the same technology used in window sensors for home security systems. The beauty is there’s nothing to set, no buttons to press—just hang it and sleep. Touch the knob, the alarm screams. Simple as that.
Why won’t it work on metal doorknobs?
Metal conducts and distorts magnetic fields differently than plastic or wood, which interferes with the sensor’s ability to detect changes. Most modern dorms, hotels, and apartments use plastic or composite knobs, so this isn’t usually an issue. If you’ve got an older building with brass knobs, you’ll want to look at a door wedge alarm instead, which works on any surface. We’re always happy to help you pick the right tool for your specific situation—just give us a call.
Is 120 decibels actually loud enough to scare someone off?
Let me put it this way: 120 decibels is approximately the same volume as a rock concert, a jet engine at takeoff, or a chainsaw running at full speed. It’s physically painful to be next to. We test these at our shows, and people cover their ears from 20 feet away. An intruder touching your doorknob or a person grabbing you on the street will absolutely release contact when this thing goes off—nobody wants that kind of attention. Plus, neighbors will hear it through walls and know something’s wrong. Criminals hate noise and attention. This delivers both.
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