They report an opening, which is earlier than reporting a presence · review
The loudest, the most configurable and the only one here with both supplied batteries and a stated life — three modes, 125 dB and thirty-one seconds.
The conclusion Three modes, 125 dB at the top, thirty-one seconds that stop only when the window closes, batteries supplied with a thirteen-month life and a low-battery light — this is the best-specified siren on the shelf and the only one that lets the same sensor suit a cabinet and a pool gate. Thirty-four dollars for five is the most expensive per unit here and the extra buys real specification. No gap figure, no tamper detection, nothing about metal frames.
No gap figure. No tamper detection. Nothing about metal frames.
Which is what 125 against 90 means.
Decibels are logarithmic: ten more is ten times the power. Thirty-five more is about three hundred, and roughly eleven times as loud to the ear.
Ninety decibels is a hairdryer through a closed door. A hundred and twenty-five is painful in the room and audible across a garden.
For a pool gate, that is the point. For a bedroom cabinet it is too much — which is why the three-mode switch is the real feature.
No other siren on this shelf offers a choice at all.
Which closes a loophole most of this shelf leaves open.
Cheap alarms sound for a fixed period and reset. An intruder opens the window, waits out the noise, and continues in silence.
SanJie states it runs for thirty-one seconds and will not stop until the opening is closed. The only way to silence it is to undo what triggered it.
That is the correct design, and it is the only statement anywhere on this shelf about what happens after the alarm starts.
Which four of the seven here do not manage.
Three LR44 cells supplied. Up to thirteen months. A flashing light when low.
Three of the four 90 dB sirens on this shelf want AAA cells that are not included, and none of them publishes a life.
Fifteen LR44s across five units is the cost at replacement time. They are cheap, and they are not in the kitchen drawer.
Like six of the seven.
This shelf’s introduction calls it the specification that decides whether the thing works on your window.
One listing on this shelf publishes a figure. This is not it.
On sale at around $34 on the American Amazon store at the time of checking.
Prices and availability are what Keepa reported on the date this page was updated; both move.
Prices quoted in this text were read on October 8, 2026. The live price is at the top of the page.
| Modes | Three: 125 dB alarm, 100 dB alarm, and 100 dB chime sounding ding-dong twice — stated. It is the only three-mode unit on this shelf; the Philips alarm here offers off, chime or alarm, and the five others have one volume and no choice |
|---|---|
| Volume | 125 dB at the top setting, stated — the loudest on this shelf, against 120 dB on the Philips and 90 dB on the three quietest units here. A 25 dB difference is roughly eighteen times the sound power |
| Trigger | Sounds continuously for 31 seconds and will not stop until the window or door is closed — stated. It is the only duration figure on this shelf, and the behavior matters: an alarm that resets itself after a fixed time can be waited out |
| Power | Three LR44 button cells, SUPPLIED, with a normal life of up to 13 months and a flashing indicator when low — stated. It is one of only two listings on this shelf with a battery life figure, and one of four where the cells are in the box |
| Type | A standalone alarm: the magnet separates, the unit sounds where it is fitted, and nothing is reported remotely. No app, no radio, no base station |
| Mounting | 3M double-sided tape on the back, with the switch set after sticking. SanJie recommends installing indoors — the only placement advice on this shelf |
| Applications | Named for pools, homes, apartments, stores, offices, garages, RVs, warehouses and hotels, and stated to fit sliding doors and windows, cabinets and drawers — the widest stated application list here |
| Gap tolerance | Not published. This shelf's introduction calls it the specification that decides whether a sensor works at all, and one listing on this shelf publishes a figure |
| Tamper | Not published, as on every listing on this shelf |
| Amazon reference | B07GY9YXL2 |
| EAN | 0680727535469 |
About three hundred times the sound power, and roughly eleven times as loud to the ear — decibels are logarithmic, so every ten adds a tenfold power increase. In practical terms, 90 dB is a loud hairdryer heard through a closed door, and 125 dB is painful in the same room and audible across a garden. For a pool gate or a front door that is the point. For a bedroom cabinet it is too much, which is exactly why the three-mode switch matters: 100 dB and a chime are the other two settings, and no other siren on this shelf offers a choice.
Because it closes a loophole. Many cheap alarms sound for a fixed period and then reset themselves, which means an intruder can open the window, wait out the noise, and proceed in silence. SanJie states that the alarm runs for 31 seconds and will not stop until the window or door is closed — so the only way to silence it is to undo the opening, which is the correct design. It is the only timing figure published on this shelf, and the only statement anywhere here about what the alarm does after it starts.
A mild one, and three of them is the trade for a thin body. LR44 button cells are cheap and widely sold, but they are not what is in the kitchen drawer, and three per unit across five units is fifteen cells at replacement time. In exchange the stated life is up to thirteen months with a flashing low-battery warning, and they come supplied — which three of the four 90 dB sirens on this shelf do not do with their AAA cells. The Philips four-pack on this shelf also uses LR44 and also supplies them.
Between security devices of the same category and nearby price. Shown: what they all state. A half-filled column says nothing.
| Model | Price | Type | Applications |
|---|---|---|---|
| SanJie YYDOA01 door and window alarm sensors, 5-pack, 125 dB with volume control | $34 | A standalone alarm: the magnet separates, the unit sounds where it is fitted, and nothing is reported remotely. No app, no radio, no base station | Named for pools, homes, apartments, stores, offices, garages, RVs, warehouses and hotels, and stated to fit sliding doors and windows, cabinets and drawers — the widest stated application list here |
| WimuPath Door and window alarm, 15-pack, 90 dB | $21 | A standalone alarm: the magnetic switch detects the opening, the unit sounds at 90 dB where it is stuck, and nothing is reported anywhere else. No app, no radio, no base station | Homes, apartments, offices, hotel rooms and garages, stated, with child safety named: preventing children and babies leaving the house |
| Philips LRM3320W/27 window and door alarm, 4-pack, 120 dB with chime mode | $19 | A standalone alarm with a magnetic sensor: it sounds where it is fitted and reports nothing remotely. No app, no radio, no base station | Windows and doors, stated. Four units per pack for extra coverage |
| HENDUN SZSF03R | $10 | Standalone magnetic contact alarm | Doors, gates, windows, pool gates, per HENDUN |
Details checked on October 8, 2026.
A pool gate, a medicine cabinet or a front door where the volume and the mode need to differ by room
Amazon reports what buyers took in the month before this page was last checked: at least 500.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for home security products and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
For Smartvest Pro · wireless opening detector · triggers configured scenarios · doors and windows
The opening detector for ABUS's Smartvest Pro alarm. It reports unauthorized opening of doors, windows and patio doors, and triggers whatever scenarios have been configured on the panel.
Best for: An ABUS Smartvest Pro system being extended door by door.
90 dB standalone siren · 3.54 × 1.18 × 0.79 in and about 0.08 lb, both published · 2 AAA, NOT included · a three-step install written out · five units for ten dollars · no gap figure, no battery life, no tamper detection
Five alarms for ten dollars with their dimensions and weight published — two figures the cheapest sirens here usually leave out.
Best for: Five openings on a tight budget, where the body has to be measured against a shallow frame first
≈ $10
120 dB alarm or chime, switched on the side: OFF / chime / alarm · 4 LR44 cells SUPPLIED · a battery TEST BUTTON and a low-battery LED, the only test button on this shelf · double-sided tape included · no gap figure, no battery life, no tamper detection
The only sensor here with a button that tells you the battery is still good — which on an alarm nobody checks is worth more than it sounds.
Best for: A household that wants a chime for the back door in the day and an alarm on it at night
≈ $19
