They report an opening, which is earlier than reporting a presence · review
Six sensors that tell your phone rather than the street — on condition you already own a base station and pay a subscription.
The conclusion Six sensors that report an opening to a system and a phone rather than screaming on the frame, with the longest battery life on this shelf — about three years — and the cells included. Ten dollars a sensor is exactly what Ring charges for pairs, so the pack is pure convenience rather than a discount. The real cost is the two conditions: a base station is required and not included, and the mobile alerts need a subscription. No gap figure on a sensor sold for being small.
No gap tolerance. No radio protocol. No tamper detection. Nothing about metal frames.
Which is the whole difference on this shelf.
At least five of the twelve sensors here are sirens on the frame: the magnet separates and the unit screams at whoever is in earshot.
These report the opening to a base station, which raises the alert. The sensor itself is silent.
That is a better system and a bigger purchase.
Ten dollars a sensor, plus two conditions.
A Ring Alarm Base Station is required and not included. Mobile alerts need a Ring Protect subscription.
Ten dollars a sensor is also exactly Ring’s two-pack rate, so the six-pack is convenience, not a discount.
If you already run a Ring Alarm, this is more coverage at the usual price. If you do not, the base station arrives in a kit from two hundred dollars — and the sirens on this shelf are ten dollars for five and need nothing.
Because the device sleeps.
A contact sensor watches a reed switch and wakes only to transmit. Two CR2032 cells on a low-power radio for three years is ordinary for the category.
It is still the longest figure on this shelf. Two listings here publish one at all; three state their AAA cells are not even in the box.
Plan for six sensors coming due at once in year three.
Which is the question to press.
Ring says the second generation is slimmer to allow more placement options, and on a narrow vinyl frame that is genuinely useful.
A smaller magnet usually means a shorter reach. Ring publishes no gap tolerance.
This shelf’s introduction says the figure is typically 10 to 25 mm (0.39 to 0.98 in) and decides everything. Test all six before peeling any of them.
On sale at around $60 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.
| Type | 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 |
|---|---|
| Requires | A Ring Alarm Base Station, stated. Without one the sensors do nothing at all, and the base station is a separate purchase — the alarm kits on this site start at two hundred dollars |
| System | Instant mobile alerts when doors and windows open require a Ring Protect subscription, stated as sold separately. The sensor reports to the base station regardless; the notification on your phone is the paid part |
| Power | 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 |
| Mounting | 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 |
| Gap tolerance | 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 |
| Protocol | Not published. The sensors talk to the base station over a radio Ring does not name on this listing, and this shelf's introduction compares radio protocol as one of five axes |
| Tamper | Not published, as on every listing on this shelf |
| Metal frames | Not published |
| Amazon reference | B07ZPLN8R3 |
| EAN | 0842861111439 |
A Ring Alarm Base Station, stated as required, and a Ring Protect subscription for the mobile alerts. That is the honest total: the sensors are ten dollars each and useless alone. If you already run a Ring Alarm the six-pack is simply more coverage at the same per-sensor rate Ring charges for pairs. If you do not, the base station comes in a kit, and the alarm kits on this site start at two hundred dollars — at which point compare the standalone 90 to 125 dB sirens on this shelf, which cost ten dollars for five and need nothing.
For a device that does nothing most of the time, yes. A contact sensor spends its life asleep watching a reed switch and wakes only to transmit an opening, so two CR2032 cells running a low-power radio for three years is an ordinary figure for the category. It is still the longest published on this shelf, where two listings give a figure at all and three state that their AAA cells are not even in the box. The thing to plan for is six sensors coming due at once in year three.
Unknown from the page, and on a sensor Ring advertises as smaller this is the question to press. Ring states the second generation is slimmer to allow more placement options, which is genuinely useful on a narrow vinyl frame — but a smaller magnet usually means a shorter reach, and Ring publishes no gap tolerance. This shelf's introduction says the figure is typically 10 to 25 mm (0.39 to 0.98 in) and decides everything; the buying tip says to test the gap before peeling the adhesive. Do that, with all six, before committing any of 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 | Power | Mounting | Gap tolerance |
|---|---|---|---|---|---|
| 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 | 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 | 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 | 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 |
| 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 | 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 | Mounts in minutes with no tools and no wiring, stated | Not published, as on at least six of the twelve listings on this shelf |
| 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 | 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 | 3M double-sided tape on the back, with the switch set after sticking. SanJie recommends installing indoors — the only placement advice on this shelf | 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 | 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 | 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 | 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 that already has a Ring Alarm base station and six more openings to cover
Amazon reports what buyers took in the month before this page was last checked: at least 4,000.
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
