They report an opening, which is earlier than reporting a presence · review
The only sensor on this shelf that needs no hub at all — and the only one that names the network it talks to.
The conclusion The only sensor on this shelf that works out of the box with nothing else bought: six openings covered, alerts on a phone, no hub, and professional monitoring available without a long contract. For a house with no alarm, eighty dollars is the whole system, and the twenty-dollar premium over Ring's hub-dependent sensors is the cheapest part of that decision. The catch is honest and it is in Ring's own words: Sidewalk coverage may vary. Nothing at all is published about the battery.
No battery type. No battery life. No gap tolerance. No tamper detection.
And it is the only sensor here that can say it.
Ring’s other sensors on this shelf are ten dollars each and require a base station that is not in the box — and the alarm kits that carry one start at two hundred dollars.
These are thirteen each and need nothing.
For a house with no alarm, eighty dollars is the whole system. The twenty-dollar premium is the cheapest part of the decision.
The only named network on this shelf, and the condition attached to it.
Amazon Sidewalk is a shared low-bandwidth network carried by Echo speakers and Ring devices — including other people’s — relaying small amounts of data for devices nearby.
That is how a sensor reaches the internet with no hub of yours. It also means the link depends on Sidewalk devices being in range, which is a function of your neighbors.
Dense suburb: likely fine. Isolated property with no Echo of your own: possibly not at all.
The page will not tell you which you are.
Which Ring publishes two listings away on this same shelf.
Two CR2032 cells and about three years, on the second-generation sensor.
Here: no type, no count, no life, no statement of whether any are included.
Long-range radio costs more power than a short hop to a hub, so do not assume three years.
Six sensors with unknown cells is six unknowns in a year.
On sale at around $80 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.
| Platform | No base station required: the sensors connect over Amazon Sidewalk, stated, with Sidewalk required for use and coverage stated to vary. It is the only network named anywhere on this shelf, and it removes the one condition that makes Ring's other sensors a larger purchase |
|---|---|
| Protocol | Amazon Sidewalk — a long-range, low-bandwidth network carried by other people's Echo and Ring devices in the neighborhood. That is what coverage may vary means: the link depends on Sidewalk devices being nearby, which is outside your control |
| Type | A system sensor that reports to an app rather than sounding where it is fitted. No local siren |
| System | 24/7 professional monitoring with emergency response for break-ins and fires is available on a compatible Ring subscription with no multi-year contracts — stated as sold separately |
| Mounting | Mounts in minutes with no tools and no wiring, stated |
| Power | Not published. No cell type, no count, no stated life and no statement of whether batteries are included — where Ring's own second-generation sensor on this shelf publishes two CR2032 cells and about three years |
| Gap tolerance | Not published, as on at least six of the twelve listings on this shelf |
| Tamper | Not published |
| Metal frames | Not published |
| Amazon reference | B0FP6HGFXW |
| EAN | 0840414688728 |
A shared low-bandwidth network carried by Echo speakers and Ring devices, which relay small amounts of data for nearby devices — including other people's. That is how a sensor reaches the internet with no hub of your own, and it is why Ring writes coverage may vary: the link depends on Sidewalk-enabled devices being in range, which is a function of your neighbors rather than your house. In a dense suburb it is likely fine. In an isolated property with no Echo of your own it may not work at all, and the page will not tell you which you are.
Eighty dollars against sixty for six, and the twenty dollars buys independence rather than hardware. Ring's second-generation sensors are ten dollars each and need a base station that does not come in the box; these are thirteen each and need nothing. If you own a Ring Alarm already, the cheaper sensors are the obvious purchase. If you do not, this pack is the whole system for eighty dollars rather than eighty plus two hundred — which makes the twenty-dollar premium the cheapest part of the decision.
The page says nothing, which is a real gap given Ring publishes two CR2032 cells and about three years on its own second-generation sensor two listings away on this shelf. No cell type, no count, no life, and no statement of whether any are in the box. Long-range radio generally costs more power than a short hop to a hub, so three years should not be assumed here. Ask before buying six, because six sensors whose cells are unknown is six unknowns in a year's time.
Between security devices of the same category and nearby price. Shown: what they all state. A half-filled column says nothing.
| Model | Price | Type | Mounting | Power | Gap tolerance |
|---|---|---|---|---|---|
| Ring Window and Door Sensor (newest model), 6-pack, no base station | $80 | A system sensor that reports to an app rather than sounding where it is fitted. No local siren | Mounts in minutes with no tools and no wiring, stated | Not published. No cell type, no count, no stated life and no statement of whether batteries are included — where Ring's own second-generation sensor on this shelf publishes two CR2032 cells and about three years | Not published, as on at least six of the twelve listings on this shelf |
| Ring Alarm Contact Sensor 6-pack, 2nd generation | $60 | A system contact sensor, not a standalone alarm. It makes no noise of its own: the opening is reported to the base station, which sounds the siren and raises the alert. At least five of the twelve sensors on this shelf are the opposite — a screamer on the frame reporting to nobody | Mounts to door and window frames with no tools required, stated. The second generation is stated to be smaller than the first, which Ring says enables more placement options | Two 3 V CR2032 cells per sensor, included, with approximately three years of stated life. It is the longest battery life published on this shelf by a factor of nearly three, and one of only two figures here | Not published. This shelf's introduction calls this the specification that decides whether a sensor works on your window, and Ring gives no figure — which matters more on a slim sensor, since a smaller magnet generally means a shorter reach |
| 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 | 3M double-sided tape on the back, with the switch set after sticking. SanJie recommends installing indoors — the only placement advice on this shelf | 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 | 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 |
| 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 | Adhesive, with an on/off switch pressed before the cells go in, then the double-sided tape peeled and the unit stuck to the frame — stated | Two AAA cells per unit, stated NOT included. Fifteen units is thirty AAA cells to buy before anything works, which is a real cost against a twenty-one dollar price | Not published. One listing on this shelf publishes a figure — 0.6 in — and this shelf's introduction calls it the specification that decides whether a sensor works at all |
Details checked on October 8, 2026.
A house with no alarm system that wants phone alerts on six openings and nothing else to buy
Amazon reports what buyers took in the month before this page was last checked: at least 2,000.
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
