Shelter · Gear Review
Best Standalone Door and Window Alarms. A few dollars a door.
For most doors and windows, the UltraPro magnetic alarm, sold for years under the GE name, is our pick: a 120-decibel siren, a chime mode for everyday use, and no hub, app, or plan. For a door that opens to a pool, there is a separate kind of alarm, and we cover it here too.
At a glance: UltraPro door and window alarm
Strengths
- A 120-decibel siren that hands-on testers found louder than they expected.
- One switch for off, chime, and alarm.
- No hub, app, or plan, and it sticks on in minutes.
- Sold in packs of 4 to 12, so each door costs a few dollars.
Limitations
- It runs on LR44 button cells behind a slide-off cover.
- Owners find the mode switch small and hard to find in the dark.
- Only people within earshot know it went off.
- It is for indoor use only, with a 90-day warranty.
The verdict
Three alarms, three kinds of door.
Our home alarm systems handbook asks who answers when an alarm sounds. With a standalone alarm the answer is simple: whoever is close enough to hear it. These picks are for the doors where that is enough.
Best for most doors and windows
UltraPro (formerly GE)
A loud siren, a chime for everyday use, and a price low enough to put one on every door and ground-floor window.
About $23 to $45 a pack
Best with a remote
Wsdcam remote door alarm
Arm and disarm from a key-fob remote, and AAA batteries in the alarm instead of button cells.
About $21 for two
For a door to the pool
Poolguard DAPT-2
Its maker states it meets UL 2017, the standard CPSC's pool guidelines name. A backstop to a fence and an adult watching, never a replacement.
About $54 to $64
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Why the pick wins
Loud, simple, and proven.
A standalone alarm has one job: make a sound when a door opens. The UltraPro does that job loudly, from a maker that has sold it for years.
01
Tested loud
Rated at 120 decibels. In hands-on testing, Bob Vila's team found it far louder than they expected.
02
A chime for every day
Chime mode tells you when a door opens without the full siren, so the alarm stays on instead of in a drawer.
03
Nothing to sign up for
No hub, no app, no account, and no plan. It keeps working through a power or internet outage.
04
A known maker
Jasco, an Oklahoma City company, sells and supports it, with a manual and a written warranty. Many look-alikes do not say who made them.
Bob Vila's team installed seven door and window alarms and set them off. They named the GE alarm, the same unit now sold as UltraPro, their best value, describing the alarm as ear-piercing and the chime as easy to hear from the next room. (Bob Vila) Their overall pick was a smart sensor system that needs a hub, which belongs with our DIY alarm system picks rather than here.
The picks
Pick by the door, and who is home.
All three run on batteries and stand alone. None of them can tell anyone who is not close enough to hear.
Best for most doors and windows
UltraPro Window and Door Alarm (formerly GE)
Two pieces: an alarm unit that sticks to the frame and a magnet that sticks to the door or sash. Open the door and it chimes or sounds a 120-decibel siren, depending on the switch. Jasco now sells it under the UltraPro name: model 45174 is the 4-pack linked here, and Amazon also carries 6- and 12-packs. (Jasco)
The user guide calls for a gap of less than half an inch between the two pieces when the door is closed, and says the alarm is for indoor use only, not wet locations. It runs on four LR44 button cells, included, for up to a year in typical use. To check the batteries, press the test button inside the cover; a green light means they are still good. (GE-era user guide)
The button cells are the one thing to plan around in a home with small children. The cover slides off and does not say it is child-resistant, so mount these out of small hands' reach and keep spare cells locked away. If that does not suit your home, the Wsdcam below runs on AAA batteries.
Specifications
Best with a remote
Wsdcam Remote Door Alarm, 2-Pack
Each alarm comes with a small remote that arms, disarms, sets a doorbell mode, or sounds a panic alarm, from up to about 49 feet away. That makes it easier to live with on a door you use often, and easier for someone who finds a tiny switch hard to work. Wsdcam rates the siren at 105 decibels, noticeably quieter than the UltraPro's rated 120, and the alarm runs on two AAA batteries, with no button cells in the alarm itself. Wsdcam's site says the AAA batteries are not included, while the Amazon listing says batteries are included. The remote takes a small 27A battery, which is included. Wsdcam states a one-year guarantee. (Wsdcam)
Three cautions. Wsdcam lists a Shenzhen, China address and email support, but no U.S. office, so there is less to go on than with Jasco. Some listings call it a pool alarm; it is not built to the pool door alarm guideline, with no adult pass-through and no UL 2017 claim, so use the Poolguard for a door to the pool. And owners report that once triggered in alarm mode, it keeps sounding until someone disarms it with the remote, so keep the remotes where the household can find them.
Specifications
For a door to the pool
Poolguard DAPT-2 Pool Door Alarm
CPSC's Pool Safely barrier guidelines, which are voluntary though some local codes adopt them, describe what an alarm on a door leading to a pool should do: start within 7 seconds of the door opening, sound for 30 seconds or more, reach at least 85 decibels at 10 feet, sound different from the phone, doorbell, and smoke alarm, let adults pass through for up to 15 seconds, have its switch at least 54 inches above the threshold and out of the reach of children, and meet UL 2017, Section 77. (Pool Safely) An ordinary chime alarm is not built to that list.
The DAPT-2's manual addresses most of that list. It states the alarm meets UL 2017 and that the horn is 85 decibels at 10 feet. It sounds 7 seconds after the door opens unless an adult presses the pass-through button, which then allows 14 seconds to go through and close the door. It must be mounted at least 54 inches above the threshold, resets automatically once the door is closed, and runs on one 9V battery, not included, for about a year, chirping every 10 seconds when the battery is low. It is for indoor use only, with a one-year warranty, and Poolguard directs owners to test it weekly. (Poolguard manual) Poolguard's site describes it as UL listed for water hazard entrance alarms; we could not check UL's directory ourselves.
Keep it in its place. The Pool Safely guidelines say barriers are not childproof and can never replace adult supervision, and the American Academy of Pediatrics says a pool fence at least 4 feet high should completely surround the pool, separating it from the house and the rest of the yard, and that door and gate alarms are not substitutes for that fence. (AAP, HealthyChildren.org) Our handbook's pool section covers the rest.
Specifications
What owners actually say
Loud, and mostly forgotten.
These patterns come from retailer reviews. A theme appears here only when more than one owner raises it independently.
UltraPro
Owners consistently describe it as very loud, and several say it still works with a small gap between the pieces.
The recurring complaints are weak included adhesive, which many owners replace with their own mounting tape, a switch that is hard to find in the dark, and a chime that sounds more like a soft alarm than a doorbell.
Wsdcam
Owners like the volume and the remote's range.
The recurring complaints are arming and disarming beeps that are loud and cannot be turned down, and that the two alarms ship paired to both remotes, so you re-pair them to control each door on its own.
Poolguard DAPT-2
Many owners bought it to pass a pool inspection.
The recurring complaints are a bulky, dated look, no off switch, so it sounds during gatherings when someone forgets the button, and fit or wiring trouble with the door sensor on some installs.
The one thing to know
It tells the room, not the world.
A standalone alarm sounds at the door and nowhere else. That is exactly right for a bedroom door at night, or a slider you want to hear open. It does nothing for a house that is empty all day.
If you want to know when a door opens while you are out, you need an alarm that can reach your phone or a monitoring center. Our DIY alarm system picks compare four that do.
How they fail, what they cost
Batteries and tape, mostly.
No plan, no subscription. Over time, these alarms cost a set of batteries now and then, and they fail in two quiet ways.
A dead battery
A dead battery looks exactly like a quiet night. Test household alarms on the day you test your smoke alarms, test a pool door alarm weekly, and replace all the cells in a unit at once.
A piece that slipped
If the magnet drifts more than about half an inch from the alarm, a closed door reads as open, or an open one never sounds. Owners often switch to their own mounting tape.
The running cost
LR44 cells for the UltraPro, AAA batteries for the Wsdcam, and a 9V battery for the Poolguard, each lasting about a year by the makers' estimates.
Button cells and small children
CPSC warns that if a child swallows button cell or coin batteries, they can cause serious injuries, including internal chemical burns and death. (CPSC) Store spares where children cannot reach them. If you suspect a child has swallowed one, CPSC says to take them to the nearest emergency department immediately, and to call the National Battery Ingestion Hotline (800-498-8666) or Poison Help (800-222-1222) for treatment information. (CPSC)
What we didn't pick
And who should skip these.
Familiar names, hard to find
When we checked in October 2026, SABRE's door and window alarm was unavailable on Amazon, and its keypad alarm kit was offered only by a third-party seller with one left.
Look-alikes with no maker
Many listings sell the same two-piece design under shifting brand names, with no manual, warranty, or support site behind them. When the hardware is this similar, a maker you can reach is worth the extra dollar.
Plug-in chimes
Door chimes that ring a plug-in receiver tell you a door opened somewhere else in the house, which is handy, but most have no siren. They are a convenience, not an alarm.
If the house is often empty
A siren nobody hears protects nothing. Choose a system that reaches your phone instead.
If the locks come first
An alarm reports the door a lock would have kept shut. Start with a deadbolt and window locks if yours are weak.
For a pool, alone
No door alarm, including our pool pick, takes the place of a fence that separates the pool from the house and an adult watching the water.
Where it fits in your readiness
A small layer that never needs the internet.
Standalone alarms belong in the Survive tier: inexpensive, independent of power and internet, and useful the day you put them up.
Power outages
Battery alarms keep working when the power and the router are down, which is when many app-based sensors go quiet.
Civil disruption
When things are unsettled nearby, a siren on the ground-floor doors and windows can wake a household when one opens, if it is close enough to be heard.
Maintenance
A few minutes, on a schedule.
- Once a month, open each door and window with the alarm on chime and confirm it sounds.
- Check the battery on each unit the way its manual describes, and replace weak cells in every unit at once.
- Press each piece firmly in place, and re-stick any that have started to lift.
- Every week, open the pool door and let the alarm sound, as Poolguard's manual directs, then confirm it resets after the door closes.
- Keep spare batteries, and any remotes, where adults can find them and small children cannot.
Questions people ask
Before you peel the tape.
Do door alarms work when the power goes out?
Standalone door alarms run on their own batteries and need no Wi-Fi, so an outage does not affect them. That is one advantage they hold over many app-based systems, which go quiet to the outside world when the router loses power.
Can I use a regular door alarm on the door to the pool?
CPSC's Pool Safely barrier guidelines, which are voluntary though some local codes adopt them, describe a specific kind of door alarm for doors that lead to a pool: one that meets UL 2017, Section 77, starts within 7 seconds, lasts 30 seconds or more, reaches at least 85 decibels at 10 feet, and has its pass-through switch at least 54 inches above the threshold and out of the reach of children. An ordinary chime alarm is not built to that guideline. The American Academy of Pediatrics adds that door alarms are an added layer, not a substitute for a pool fence that separates the pool from the house. (Pool Safely; AAP)
Will a door alarm work on a sliding door?
Yes, if the two halves line up when the door is closed. The UltraPro manual calls for a gap of less than half an inch between the alarm and its magnet, so mount the alarm on the frame and the magnet on the moving panel where they meet.
How do I know when a door alarm's batteries are low?
It depends on the model. The UltraPro's user guide describes a battery-test button inside the battery cover, and the Poolguard DAPT-2 chirps every 10 seconds when its battery runs low. Test household door alarms on the day you test your smoke alarms, and test a pool door alarm weekly, as Poolguard's manual directs.