20 Best Refrigerator Door Alarm [2024]

Are you looking for the best refrigerator door alarm? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling refrigerator door alarm.

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1 FRIDGGI - Refrigerator Door Alarm when Left Open, Freezer Door Open Chime, 60sec, 120sec, 180sec... FRIDGGI - Refrigerator Door Alarm when Left Open, Freezer Door Open Chime, 60sec, 120sec, 180sec...
2 WSDCAM Freezer Door Alarm with Delay When Left Open, 3/15/30/60 Seconds Adjustable Delay... WSDCAM Freezer Door Alarm with Delay When Left Open, 3/15/30/60 Seconds Adjustable Delay...
3 WSDCAM Freezer Door Alarm When Left Open, 3/15/30/60 Seconds Adjustable Delay Wireless Fridge Alarm,... WSDCAM Freezer Door Alarm When Left Open, 3/15/30/60 Seconds Adjustable Delay Wireless Fridge...
4 Fridge Door Alarm with Delay Upgrade 3/15/30/60 Seconds Security Window/Door Alarm for Home Safety... Fridge Door Alarm with Delay Upgrade 3/15/30/60 Seconds Security Window/Door Alarm for Home...
5 Doorsound - Refrigerator Freezer Door Alarm When Left Open with Adjustable time delay, Text (SMS)... Doorsound - Refrigerator Freezer Door Alarm When Left Open with Adjustable time delay, Text (SMS)...
6 WSDCAM Refrigerator Alarm When Opened 60 Seconds Time Delay, 90dB Loud, Ultra-slim Wireless Fridge... WSDCAM Refrigerator Alarm When Opened 60 Seconds Time Delay, 90dB Loud, Ultra-slim Wireless...
7 EdgeStar VBM101 22 Inch Wide 10.1 Cu. Ft. Commercial Beverage Merchandiser With Temperature Alarm... EdgeStar VBM101 22 Inch Wide 10.1 Cu. Ft. Commercial Beverage Merchandiser With Temperature Alarm...
8 AcuRite Digital Wireless Fridge and Freezer Thermometer with Alarm and Max/Min Temperature for Home... AcuRite Digital Wireless Fridge and Freezer Thermometer with Alarm and Max/Min Temperature for...
9 3in1 Alarm - Door Alarm with Delay 80 to 120 dB, Close Door Reminder, Time Delay Door Chime,... 3in1 Alarm - Door Alarm with Delay 80 to 120 dB, Close Door Reminder, Time Delay Door Chime,...
10 WSDCAM Refrigerator Alarm When Opened 60 Seconds Time Delay, 90dB Loud, Ultra-slim Wireless Fridge... WSDCAM Refrigerator Alarm When Opened 60 Seconds Time Delay, 90dB Loud, Ultra-slim Wireless...
11 GE Personal Security Window and Door Alarm, 4 Pack, DIY Protection, Burglar Alert, Wireless,... GE Personal Security Window and Door Alarm, 4 Pack, DIY Protection, Burglar Alert, Wireless,...
12 GREENCYCLE 2PK Door and Window Alarm 4-in-1 Mode Window Alarms for Wireless Alarm Security System... GREENCYCLE 2PK Door and Window Alarm 4-in-1 Mode Window Alarms for Wireless Alarm Security System...
13 (New Version) AMIR Refrigerator Thermometer, Wireless Indoor Outdoor Thermometer, Sensor Temperature... (New Version) AMIR Refrigerator Thermometer, Wireless Indoor Outdoor Thermometer, Sensor...
14 Time Delay Door Alarm 5-in-1 Mode Freezer Door Alarm When Left Open with130dB, Door Sensor Chime... Time Delay Door Alarm 5-in-1 Mode Freezer Door Alarm When Left Open with130dB, Door Sensor Chime...
15 Window Door Alarm,125dB Pool Alarm Magnet Sensor Trigger for Home Kids Safety Burglar Alarm for... Window Door Alarm,125dB Pool Alarm Magnet Sensor Trigger for Home Kids Safety Burglar Alarm for...
16 AcuRite Digital Wireless Fridge and Freezer Thermometer with Alarm and Max/Min Temperature for Home... AcuRite Digital Wireless Fridge and Freezer Thermometer with Alarm and Max/Min Temperature for...
17 Wsdcam Door and Window Alarm for Home Wireless Alarm Security System Magnetic Alarm Sensor Close... Wsdcam Door and Window Alarm for Home Wireless Alarm Security System Magnetic Alarm Sensor Close...
18 SCHLAGE Z-Wave Connect Camelot Touchscreen Deadbolt with Built-In Alarm, Satin Nickel, BE469 CAM... SCHLAGE Z-Wave Connect Camelot Touchscreen Deadbolt with Built-In Alarm, Satin Nickel, BE469 CAM...
19 ThermoPro TP-16 Large LCD Digital Cooking Food Meat Smoker Oven Kitchen BBQ Grill Thermometer Clock... ThermoPro TP-16 Large LCD Digital Cooking Food Meat Smoker Oven Kitchen BBQ Grill Thermometer...
20 Freezer Sounds and Ringtones Freezer Sounds and Ringtones
SaleBestseller No. 1
FRIDGGI - Refrigerator Door Alarm when Left Open, Freezer Door Open Chime, 60sec, 120sec, 180sec...
  • GENTLE ALARMS - Alert after 1 minute (for 2 seconds), a second alarm after 2 minutes (for 4 seconds) when the fridge door is still open or ajar.
  • CONTINUOUS ALARM - Alert after 3 minutes (stay 60 seconds) will help you close the fridge or freezer door in normal situations.
  • REPEATED SIREN - Loud Mode includes an additional 110dB Siren every 4 minutes (stay 20 seconds), activate using SET Button (4 beeps confirmation).
  • FOUR MODES - Quiet (80dB), Medium (85dB), Normal (90dB with a beep every 10s), Loud (95dB, with a beep every 10s and a 110db Siren every 4 minutes).
  • EASY TO USE - FRIDGGI emits a low volume beep when you exceed the allowed gap between the Alarm and the mini sensor; open/close the door to check...
SaleBestseller No. 2
WSDCAM Freezer Door Alarm with Delay When Left Open, 3/15/30/60 Seconds Adjustable Delay...
  • Wireless fridge alarm goes off if the freezer door stays open for 3/15/30/60 seconds, you can easily to set the delay time as your need. It will only...
  • Simple peel and stick installation, easy to install on any freezer/fridge or any door without any tools, come with adhesive tapes
  • This alarm with 4 modes, it’s not only a refrigerator alarm, but also a door alarm for home security helps deter intruder/thieves effectively by...
  • 4-in-1 Mode: 1. Time Delay Alarm (sounds “Di-Di-Di” from 0dB to 108dB if door stays open for 3/15/30/60s) 2. General Alarm (alarm stop if door...
  • Low battery warning. Installation Note: Ensure close the alarm and magnetic strip, the installation distance between them should not exceed 0.78 inch....
Bestseller No. 3
WSDCAM Freezer Door Alarm When Left Open, 3/15/30/60 Seconds Adjustable Delay Wireless Fridge Alarm,...
  • Wireless freezer alarm goes off if the freezer door stays open for 3/15/30/60 seconds, you can easily to set the delay time as your need. It will only...
  • Simple peel and stick installation, easy to install on most of freezers/fridges or any door without any tools, come with adhesive tapes, package...
  • This alarm with 4 modes, it’s not only a refrigerator alarm, but also a door alarm for home security helps deter intruder/thieves effectively by...
  • 4-in-1 Mode: 1. Time Delay Alarm (sounds “Di-Di-Di” from 0dB to 108dB if door stays open for 3/15/30/60s) 2. General Alarm (alarm stop if door...
  • Low battery warning. Installation Note: Ensure close the alarm and magnetic strip, the installation distance between them should not exceed 0.78 inch....
Bestseller No. 4
Fridge Door Alarm with Delay Upgrade 3/15/30/60 Seconds Security Window/Door Alarm for Home Safety...
  • Keep Your Family Safety: Door and window alarm helps deter intruder/thieves effectively by 108dB loud alarm, also door open chime will notify you if...
  • 4 Modes Meet Your Multi-options and Easy to Use: General Alarm, Constant Alarm, Time Delay (Closing-door Alert), Doorbell 4 in 1 Multi-Function, just...
  • Widely Use: Magnetically triggered door alarm sensor protecting house by door window entry and suitable for safe box, cabinet, Freezers,...
  • Professional Security System by Simply Installation: Simple peel and stick installation & Low consumption design, providing convenient and long term...
  • Umiitto Alarm sensor offering high quality 2*AAA batteries for each set. please let us know if you have any confusions or need help. We are more than...
Bestseller No. 5
Doorsound - Refrigerator Freezer Door Alarm When Left Open with Adjustable time delay, Text (SMS)...
  • Doorsound is programmable WiFi door alarm that goes off and can send text messages when someone left the door open or ajar. You can program WHEN the...
  • Doorsound can send out text message notifications. Tired of unreliable phone app notifications? Receive actual text alerts. (WiFi connection is...
  • You can program multiple reminders. For example, you can program the first alert to go off when the door is left open for 30 seconds, the second alert...
  • Doorsound supports wide door gaps. Use it on your refrigerator/freezer door, front door, pool door, cabinet doors
  • Doorsound has many more features! Get notifications on your phone with the IFTTT app! Have you Google Home announce when the door is left open!...
Bestseller No. 6
WSDCAM Refrigerator Alarm When Opened 60 Seconds Time Delay, 90dB Loud, Ultra-slim Wireless Fridge...
  • 60s DELAY - Wireless freezer alarm keeps ringing if the freezer door stays open for 60 seconds. It will only alert you when freezer door has been left...
  • 90 DECIBELS - Loud enough to alert you but not super loud. Helps notify you effectively by 90dB chime. Never worry about wasting foods, make food...
  • 0.32" ULTRA-SLIM DESIGN - Ultra-slim door open alarm, save space and suitable for most of freezers/fridges. Size: 3.15" x 1.38" x 0.32". Just ON/Off...
  • EASY TO INSTALL - Simple peel and stick installation, easy to install on any freezer/fridge or any door without any tools, come with adhesive tapes....
  • LOW BATTERY WARNING. Replace batteries when the LED light flash once every 2seconds. Battery works up to 2 years. Installation Note: Ensure close the...
Bestseller No. 7
EdgeStar VBM101 22 Inch Wide 10.1 Cu. Ft. Commercial Beverage Merchandiser With Temperature Alarm...
  • 10.1 cubic feet of storage with four (4) adjustable shelves included; for use in built-in or freestanding applications
  • Cools to temperatures as low as 34 degrees Fahrenheit, allowing beverages to get as close to freezing as possible
  • Door ajar alarm will sound if the door is open for an extended period of time and temperature alarm help ensure beverages remain cold
  • Easily monitor and change the temperature with the sleek touch control panel and LED lighting elegantly displays your beverage collection
  • Dimensions: Depth: 23-1/2" x Height: 64-3/8" x Width: 22"
SaleBestseller No. 8
AcuRite Digital Wireless Fridge and Freezer Thermometer with Alarm and Max/Min Temperature for Home...
  • Digital Thermometers: Includes one refrigerator thermometer and one freezer thermometer that transmit readings to the digital display
  • Easy-to-Read LCD Display: Comes with magnetic backing for fridge mounting, a keyhole for mounting on a wall, and a foldout stand for countertop...
  • Customizable Temperature Alarms: Be alerted to temperature spikes caused by mistakenly leaving the fridge or freezer door open or a failing appliance
  • Multipurpose Silicone Sensor Straps: Can be used with the included suction cups or wrapped around a wire shelf inside the fridge or freezer
  • Modern Stainless Steel Finish: Fits and looks great in any kitchen
Bestseller No. 9
3in1 Alarm - Door Alarm with Delay 80 to 120 dB, Close Door Reminder, Time Delay Door Chime,...
  • MODE D - Alert after 60 seconds, a reminder every 30s, auto stop after 120min or door closed (Garage, Basement door...).
  • MODE C - Alert after 30 seconds, a reminder every 20s, auto stop after 60min or door closed (Laboratory, Factory door...).
  • MODE B - Alert after 10 seconds, a reminder every 15s, auto stop after 30min or door closed (Alarm bypass, Patio door...).
  • MODE A - Alert after 5 seconds, a reminder every 10s, auto stop after 30min or door closed (Kid, Dog, Cat escape...).
  • MODE E - Alert after 0 second, a reminder every 5s, auto stop after 30min or door closed, 80dB or 120dB (Entry chime, Anti-theft Alarm).
Bestseller No. 10
WSDCAM Refrigerator Alarm When Opened 60 Seconds Time Delay, 90dB Loud, Ultra-slim Wireless Fridge...
  • 60s DELAY - Wireless freezer alarm keeps ringing if the freezer door stays open for 60 seconds. It will only alert you when freezer door has been left...
  • 90 DECIBELS - Loud enough to alert you but not super loud. Helps notify you effectively by 90dB chime. Never worry about wasting foods, make food...
  • 0.32" ULTRA-SLIM DESIGN - Ultra-slim door open alarm, save space and suitable for most of freezers/fridges. Size: 3.15" x 1.38" x 0.32". Just ON/Off...
  • EASY TO INSTALL - Simple peel and stick installation, easy to install on any freezer/fridge or any door without any tools, come with adhesive tapes....
  • LOW BATTERY WARNING. Replace batteries when the LED light flash once every 2 seconds. Battery works up to 2 years. Installation Note: Ensure close the...
SaleBestseller No. 11
GE Personal Security Window and Door Alarm, 4 Pack, DIY Protection, Burglar Alert, Wireless,...
  • 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...
  • 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 in a set...
  • 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...
  • 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...
Bestseller No. 12
GREENCYCLE 2PK Door and Window Alarm 4-in-1 Mode Window Alarms for Wireless Alarm Security System...
  • [4 modes Alarm] General Magnetic Alarm: alarm is triggered when the door or window is opened.Constant Alarm: Once the alarm is triggered, even if the...
  • [Super Loud Alarm]Door/window anti-theft alert has up to 110lb LOUD alarm, scare off potential thieves effectively, also prevent children /pets going...
  • [Widely Applicable]small size alarm suitable for window (sliding/crank/hung so on ), pool doors, refrigerator, drawer, freezers, interior door for...
  • [Easy operation]Press on/off 1/2/3/4 times to switch 4 modes Alarm, also press on/off switch to power on/off. Low consumption, battery can last...
  • [Easy installation]Come with LR44 batteries and adhesive tape. Easily mount to windows or doors with included double sides adhesive tape, no tools...
SaleBestseller No. 13
(New Version) AMIR Refrigerator Thermometer, Wireless Indoor Outdoor Thermometer, Sensor Temperature...
  • 【Temperature Range】The indoor/outdoor thermometer range: Indoor -10℃~ 60℃ (14℉~ 140℉), Outdoor -40℃~ 60℃ (-40℉~140℉) and the...
  • 【Audio Alarm】The Wireless Thermometer console includes audible and visual alarms when temperature exceed your pre-set minimum and maximum alarm...
  • 【Easy to Read Display】The LCD screen with large digit.Records Min and Max temperature provides the historical temperatures readings. With this...
  • 【Multiple Installtion Ways】The wireless thermometer is easy to install. The display unit can stand on the table, hang on the wall, magnet on the...
  • 【Operate Easily】There are 6 function keys on the main unit and signal indicator on the transmitter, you just press the corresponding key to turn...
Bestseller No. 14
Time Delay Door Alarm 5-in-1 Mode Freezer Door Alarm When Left Open with130dB, Door Sensor Chime...
  • FRIDGE DOOR ALARM WITH DELAY : freezer door alarm alert if the door stays open for 15 seconds, It will only alert you after freezer door has been left...
  • DOOR OPEN ALARM WITH 5 MODES: Door left open alarm not only a refrigerators/freezers/fridge alarm, but also a window door alarms for home security...
  • EASY TO INSTALL :Simple peel and stick installation, easy to install on any doors /windows( (sliding/crank/hung… ), without any tools, come with...
  • Low battery warning: When the battery is low, will soud Di di …to remind you Installation Note: Ensure close the alarm and magnetic strip, the...
  • 100% SATISFACTION SERVICE - 3xLR44 batteries included,.Sanjie provides 100% customer satisfaction guarantee, 1-year warranty and 24*7 customer...
Bestseller No. 15
Window Door Alarm,125dB Pool Alarm Magnet Sensor Trigger for Home Kids Safety Burglar Alarm for...
  • Multiple Alarm Modes:Immediate alarm, delayed alarm, doorbell, 30 second alarm, Di-Di remind alarm (intermittently ringing).
  • 3 Level Adjustable Volume From 100dB to 125dB. : The Magnetic sensor window door alarm loud enough to notice.Not only it can be used to protect...
  • Easy to install: Use Double-sided tape, tape it on a window door or anywhere you need, then all done! No any wiring or screws needed.Fit...
  • Instant Alarm Reminder: The minimum trigger distance is 0.59inch.The alarm will be triggered and alarm immediately when  doors or windows...
  • Double-side magnetic sensor alarm: More places can use it than single side sensor.(IT FITS ON FLAT DOOR AND FRAME.)
Bestseller No. 16
AcuRite Digital Wireless Fridge and Freezer Thermometer with Alarm and Max/Min Temperature for Home...
  • Digital Thermometers: Includes one refrigerator thermometer and one freezer thermometer that transmit readings to the digital display
  • Easy-to-Read LCD Display: Comes with magnetic backing for fridge mounting and a keyhole for mounting on a wall
  • Customizable Temperature Alarms: Be alerted to temperature spikes caused by mistakenly leaving the fridge or freezer door open, or a failing appliance
  • Multipurpose Silicone Sensor Straps: Can be used with the included suction cups or wrapped around a wire shelf inside the fridge or freezer
  • Temperature Range: -40 °F to 100 °F (-40 °C to 37 °C)
Bestseller No. 17
Wsdcam Door and Window Alarm for Home Wireless Alarm Security System Magnetic Alarm Sensor Close...
  • Door window alarm deterring thieves effectively by 110dB loud alarm, also prevent children /pets going out the house without notice
  • Window alarm sensors with 4 modes -- Not only on/off setting, but also General Alarm, Constant Alarm, Closing-door Alert and Doorbell Mode. You can...
  • This wireless alarm with high quality and small size, suitable for most of doors windows (sliding/crank/hung....doors and windows ), cabinets, and...
  • Easy operation, press on/off switch to power on/off. Low consumption, battery can last longer. With low battery warning, if in low battery, it will...
  • Simple peel and stick installation, package Includes everything you need when install. Came with LR44 batteries and adhesive tape. If you need any...
SaleBestseller No. 18
SCHLAGE Z-Wave Connect Camelot Touchscreen Deadbolt with Built-In Alarm, Satin Nickel, BE469 CAM...
  • Works with Alexa for voice control (hub required, Alexa device and hub sold separately)
  • Touch Screen keypad and lock cylinder on exterior and thumb turn interior. Door thickness range is 1.37 to 1.75 standard
  • Stores up to 30 personalized user codes at a time
  • Built in alarm with 3 alert settings. Battery Uses 4 AA alkaline batteries. Exterior Dimensions 3 x 5 x 1 inches. Interior Dimensions 3 x 8 x 2...
  • Z wave technology connects to your home automation system and lets you lock or unlock your door remotely via the web or smartphone.Volts:6 V
SaleBestseller No. 19
ThermoPro TP-16 Large LCD Digital Cooking Food Meat Smoker Oven Kitchen BBQ Grill Thermometer Clock...
  • Cook mode with USDA preset temperature settings: ThermoPro cooking thermometer ideal for meat, oven, smoker or stove top; Programmable alert with...
  • Timer mode: Digital kitchen timer features countdown and countup ability, up to 99 hours, 59 minutes
  • High accuracy and heat resistance: Meat probe and wire can withstand up to 716 degrees Fahrenheit, you can cook with wide temperature range from 32 to...
  • Easy operation: Accurate grill meat thermometer with 6.5 inches food grade stepdown tip design stainless steel probe to get temperature precisely and...
  • Convenient storage: Digital food thermometer, features a magnetic back to allow you to easily attach to refrigerator or any metal surface; a hanging...
Bestseller No. 20
Freezer Sounds and Ringtones
  • The best sounds!
  • Save as alarms!
  • Save as notifications!
  • Save as ringtones!
  • Customize your device!

Having trouble finding a great refrigerator door alarm?

This problem is well understood by us because we have gone through the entire refrigerator door alarm research process ourselves, which is why we have put together a comprehensive list of the best refrigerator door alarms available in the market today.

After hours of searching and using all the models on the market, we have found the best refrigerator door alarm for 2023. See our ranking below!

How Do You Buy The Best Refrigerator Door Alarm?

Do you get stressed out thinking about shopping for a great refrigerator door alarm? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching refrigerator door alarm, which is why we have assembled a comprehensive list of the greatest refrigerator door alarm available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for refrigerator door alarm that you consider buying. Your questions might include the following:

  • Is it worth buying an refrigerator door alarm?
  • What benefits are there with buying an refrigerator door alarm?
  • What factors deserve consideration when shopping for an effective refrigerator door alarm?
  • Why is it crucial to invest in any refrigerator door alarm, much less the best one?
  • Which refrigerator door alarm are good in the current market?
  • Where can you find information like this about refrigerator door alarm?

We’re convinced that you likely have far more questions than just these regarding refrigerator door alarm, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for refrigerator door alarm, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible refrigerator door alarm. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an refrigerator door alarm buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available refrigerator door alarm currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of refrigerator door alarm has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an refrigerator door alarm?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your refrigerator door alarm.
  5. Customer Ratings: Number ratings grade refrigerator door alarm objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their refrigerator door alarm.
  7. Product Quality: You don’t always get what you pay for with an refrigerator door alarm, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an refrigerator door alarm is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining refrigerator door alarm information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding refrigerator door alarm is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

Related Post:

FAQ:

Q: How to use GE Profile refrigerator door alarm?

A: How to Use GE Profile Refrigerator Door Alarm. Press and hold the “Door Alarm” button on the control panel until the indicator light turns on (the control panel is located on the water and ice dispenser). Check that both doors are shut when the alarm sounds.

Q: How to make door alarm at home?

A: Glue the clothespin to the board. Remove your board from the wall. … Manage excess wires with tape and hang the board. Wires sticking out in all directions can be a hazard. Attach the string to the piece of cardboard in the clothespin. Tape a piece of string to the cardboard. Fasten the other end of the string to your door. …

Q: How to turn off door alarm?

A: Open the door. Start by opening the door of the alarm system,if you have a door covering the system. Press the buttons. Press “*” and “4” down at the same time,and hold it until you hear three beeps. Press a second time. Let go of the buttons,then press them both down again. Shut the door. Close the door of the alarm system,if necessary. …

Q: How to build door alarm?

A: Collect All Parts. Please be sure to get the right type of reed contact. Alarm devices usually use NC (normaly close). … Open the Smoke Alarm. Now the fun starts. … On/off It Goes. Now you should have two loose wire ends. … Close It. Put the PCB back in place. … Install It. Now connect the lose end of the cable to the door contact. …