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  • Philips Personal Security Window/Door Alarm, 2-Pack, DIY Protection, Burglar Alert, Wireless, Magnetic Sensor, Easy Installation, Ideal for Home, Garage, Apartment, Dorm, RV and Office, LRM3420W/27
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Philips Personal Security Window/Door Alarm, 2-Pack, DIY Protection, Burglar Alert, Wireless, Magnetic Sensor, Easy Installation, Ideal for Home, Garage, Apartment, Dorm, RV and Office, LRM3420W/27

4.4 out of 5 stars 233 ratings
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Purchase options and add-ons

Colour White
Brand Philips Accessories
Power source Battery Powered
Compatible devices Home Security System
Battery description LR44

About this item

  • Safe and Secure – Ward off would-be intruders with a 120-decibel alarm triggered by a high-quality magnetic sensor, or choose for a chime to sound when windows or doors are opened and closed
  • User Friendly – Features an easy-to-use OFF/CHIME/ALARM switch on the side of the alarm to let you choose your preference of alert, comes as a pair to provide extra coverage for your home
  • Easy Install – Experience completely wire and hassle-free mounting with the included double-sided tape, everything you need is included in the box
  • Battery Operated – Powered by four long-life LR44 button batteries (included) and features a battery test button and low battery indicator to keep you notified of current power levels
  • Peace of Mind – This home security product is designed to fortify your home with a reliable layer of protection, empowering you to live your life free of worry

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Product information

Technical Details

Voltage ‎6 Volts (DC)
Control method ‎App
Noise level ‎120 dB
Mounting type ‎Wall Mount
Sensor technology ‎Contact Sensor
UPC ‎030878477109
Manufacturer ‎Jasco
Place of Business ‎OKLAHOMA CITY, OK, 73114 US
Part Number ‎LRM3420W/27
Product Dimensions ‎2.16 x 11.94 x 12.7 cm; 90 g
Item model number ‎LRM3420W/27
Size ‎2 Pack
Item Package Quantity ‎1
Included Components ‎2 Window/Door Alarms
Batteries Included? ‎Yes
Batteries Required? ‎Yes
Battery Cell Type ‎Alkaline
Battery Description ‎LR44
Warranty Description ‎1-Year Limited Warranty
Item Weight ‎90 g
Country of origin ‎China

Additional Information

ASIN B08G3VWJVG
Customer Reviews
4.4 out of 5 stars 233 ratings

4.4 out of 5 stars
鶹 Rank
Date First Available Aug. 21 2020

Feedback

Philips Personal Security Window/Door Alarm, 2-Pack, DIY Protection, Burglar Alert, Wireless, Magnetic Sensor, Easy Installation, Ideal for Home, Garage, Apartment, Dorm, RV and Office, LRM3420W/27

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Product description

These Philips Battery-Operated Window and Door Alarms provide a simple-to-use, cost-effective security solution to protect you and your family. Thanks to reliable magnetic sensors and 120-decibel alarms, a would-be intruder will think twice about entering your home. This pair of user-friendly alarms will provide you with the extra coverage you need. You can also choose between alarm or chime modes with the flip of a switch. When installed and armed, the alarm will activate if the window or door is opened, alerting you and deterring unwanted visitors. The uncomplicated, wire-free design of these alarms are perfect for homes, apartments, dorm rooms and offices alike. Use the included double-sided mounting tape to attach them to your window or door of choice within minutes. Supply power to each alarm with four LR44 button batteries (included). Experience great peace of mind by adding a dependable layer of security to your home with these Philips Battery-Operated Window and Door Alarms!

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Price$16.97$25.89$24.99$25.48$17.99-10%$15.29
Was: $16.99
Delivery
—
Get it by Sunday, Aug 10
Get it by Sunday, Aug 10
—
Get it by Sunday, Aug 10
Get it by Sunday, Aug 10
Customer ratings
4.44.4 out of 5 stars233
4.04.0 out of 5 stars290
4.24.2 out of 5 stars415
4.54.5 out of 5 stars240
4.34.3 out of 5 stars4,057
4.44.4 out of 5 stars1,977
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Customer reviews

4.4 out of 5 stars
233 global ratings

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Customers say

Customers like the functionality, ease of installation, and loudness of the alarm. They mention it serves its purpose of a door alarm, is easy to use, and has a clear sound. Some also say it's good value for money.

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FunctionalityEasy to installLoudnessValue for money
9 customers mention "Functionality"9 positive0 negative

Customers like the functionality of the alarm. They mention it's effective, serves the purpose of a door alarm, and is an awesome replacement for their book.

"good product and good service" Read more

"...These were easy to install (less than 5 mins with no tools) and function very well. When they said these were loud, they aren’t kidding!..." Read more

"I think this alarm is awesome however not my apartment manager or other tenants !..." Read more

"Good system, nice and loud, easy to install." Read more

8 customers mention "Easy to install"8 positive0 negative

Customers find the alarm easy to install. They mention it works well, has a clear sound, and is simple to use. Some say it takes less than 5 minutes with no tools.

"...The product: These were easy to install (less than 5 mins with no tools) and function very well...." Read more

"...Very easy to set up too and small" Read more

"Easy to use good quality product" Read more

"...Super easy to install and works well. Excellent bang for the buck too!" Read more

5 customers mention "Loudness"5 positive0 negative

Customers are satisfied with the loudness of the alarm. They mention they're not kidding.

"...When they said these were loud, they aren’t kidding! Easily audible throughout our house." Read more

"Does what it’s suppose to do. Loud and easy to install" Read more

"Super loud..." Read more

"Good system, nice and loud, easy to install." Read more

3 customers mention "Value for money"3 positive0 negative

Customers are satisfied with the value for money of the alarm.

"The dollar-to-value ratio on this goes crazy. Never thought something so cheap could bring this level of comfort. The product:..." Read more

"...But overall it's all working well good value for our money." Read more

"...Super easy to install and works well. Excellent bang for the buck too!" Read more

Top reviews from Canada

Translate all reviews to English
  • Jack
    5.0 out of 5 stars Incredible value
    Reviewed in Canada on May 11, 2025
    Verified Purchase
    The dollar-to-value ratio on this goes crazy. Never thought something so cheap could bring this level of comfort.

    The product:
    These were easy to install (less than 5 mins with no tools) and function very well.
    When they said these were loud, they aren’t kidding! Easily audible throughout our house.
    One person found this helpful
    Helpful
     Report
  • Nach
    5.0 out of 5 stars
    Reviewed in Canada on May 27, 2025
    Verified Purchase
    Excellente qualité
    Helpful
     Report
  • Caity H
    4.0 out of 5 stars Super loud
    Reviewed in Canada on March 26, 2025
    Verified Purchase
    The media could not be loaded.
    I think this alarm is awesome however not my apartment manager or other tenants ! Just hearing the chime alert on I got in trouble and was told I had to take it down but I would keep them if I could thy Def do the trick super loud almost deafening! Very easy to set up too and small
    Helpful
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  • St Joseph Parish
    5.0 out of 5 stars great security alert
    Reviewed in Canada on April 11, 2025
    Verified Purchase
    Good system, nice and loud, easy to install.
    Helpful
     Report
  • 鶹 customer
    5.0 out of 5 stars good replacement for my book .
    Reviewed in Canada on February 23, 2025
    Verified Purchase
    good product and good service
    Helpful
     Report
  • Debbie Janes
    5.0 out of 5 stars Loud
    Reviewed in Canada on February 28, 2025
    Verified Purchase
    Pretty good
    Helpful
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  • François Goyette
    5.0 out of 5 stars Tous les alarmes
    Reviewed in Canada on January 16, 2025
    Verified Purchase
    Alarme de portes fonctionne bien acheter pour personnes handicapées
    Helpful
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  • Kevin Boisvert
    4.0 out of 5 stars Facile d'installation et efficace.
    Reviewed in Canada on December 16, 2024
    Verified Purchase
    Installation avec des bandes collante,simplement s'assuré d'avoir assez d'espace AVEC l'épaisseur de la bande. Le son est net et l'utilisation simple au possible. J'aurais peut-être marqué un peu plus la résistance entre les mode ( passe tout droit quand on souhaite placer au mode central sur le commutateur).
    Helpful
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Top reviews from other countries

  • Ashley
    5.0 out of 5 stars Loud and Effective!
    Reviewed in the United States on July 21, 2025
    Verified Purchase
    Love these! Loud and effective! Nobody can come in my house without me hearing them! Already comes with the battery. Worth it for the price!
    Report
  • Randy Powell
    4.0 out of 5 stars works great, people, not so much
    Reviewed in the United States on June 30, 2025
    Verified Purchase
    Work as intended for front door at work (boss here). Others are complaining about the chime because it surprises/annoys them. So now... no one hears when a customer come in.or leaves
    Report
  • Steve Olsen
    5.0 out of 5 stars Great price and works well.
    Reviewed in the United States on April 27, 2025
    Verified Purchase
    For the price these are a bargain. It can be set to chime as a door open notice or set to give a very loud alarm. Super easy to set up and use.
    Report
  • DMdeA
    5.0 out of 5 stars Loud and easy to install
    Reviewed in the United States on August 10, 2024
    Verified Purchase
    I used it as a reminder to keep the basement door closed. Easy to install and is reliable. I installed it using adhesive, which worked well because the battery door is on the front. It is small, so it fit well. It would be great for burglars, but it is a bit loud for my use. I really like it and will keep it for other purposes. I replaced it with an alarm that has a two volume control.
    Report
  • Susan Bridges
    3.0 out of 5 stars Super loud
    Reviewed in the United States on July 7, 2024
    Verified Purchase
    Works as expected, the sound is super loud so if you have a small area, it’s a little loud. The sound is also a little obnoxious, maybe a different tone would be better.
    Report

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