Pet immunity is a stated weight limit, and it is measured at floor level · review
Ring's motion detector for its Alarm system: an instant notification to a phone when motion is detected, in a smaller housing than the previous generation and installable without tools.
The conclusion A component, not a product. Inside a Ring Alarm it is the right sensor; outside one it does nothing.
This is a component of the Ring Alarm system, and the review is short because the decision was made when you chose the system.
A notification. The standalone detectors in this hub either make a noise where they are or chime a receiver in the house; sensors tied to a hub, like the Tapo T100 with its H100, also notify a phone. This one tells yours, wherever you are — which is the entire difference between knowing tonight and knowing tomorrow morning.
A hallway, a landing, or the space between a back door and the rest of the house: somewhere a person has to cross to get anywhere. A motion detector in the corner of a spare room reports very little.
Not opposite a window, where sunlight tracks across the floor. Not above a radiator, whose warm air rises through the sensor’s field. And mounted so people move across the beams rather than straight at them, because PIR sensors are far less sensitive to approach than to crossing.
Range and angle. Where a manufacturer does not state a figure, this page does not supply one — placement principles above hold regardless. The listing does state AA battery power, wall or corner mounting, motion settings that ignore pets, and compatibility with first- and second-generation Ring Alarm base stations.
An existing Ring Alarm household. Nobody else.
On sale at $150 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 September 2, 2026. The live price is at the top of the page.
| Type | PIR motion detector for Ring Alarm |
|---|---|
| Alerting | Instant notification to a mobile phone |
| Installation | Wall or corner, no tools required |
| Design | More compact than the previous generation |
| Power | AA batteries |
| Pets | Motion settings to ignore pets, stated by Ring |
| Compatibility | Ring Alarm base station required, 1st or 2nd generation |
| Amazon reference | B08J6C5JJN |
| EAN | 0840080582931 |
No. It is a component of that system and does nothing on its own. If you do not already have a Ring Alarm base station, the price of this sensor is not the price of the capability.
Because the standalone alarms in this hub make a noise in an empty building. A notification means you know while it is happening — which is the difference between finding out at nine in the evening and finding out at nine the next morning.
In a corner of a room somebody must cross to get anywhere else — a hallway, a landing, the space between the back door and the rest of the house. Not facing a window, not above a radiator, and positioned so people move across its field rather than towards it.
8.1/ 10
A component, not a product. Inside a Ring Alarm it is the right sensor; outside one it does nothing.
Between security devices of the same category and nearby price. Shown: what they all state. A half-filled column says nothing.
| Model | Price | Power |
|---|---|---|
| Ring Alarm Motion Detector (2nd gen) | $150 | AA batteries |
| seanme Long range wireless driveway alarm, 4 sensors and 1 receiver | $35 | Three AAA cells per sensor, stated NOT included — twelve cells across four sensors. The receiver plugs into a standard outlet, so only the sensors need cells |
| BESTOONE MSA-21 motion sensor alarm, 2 sensors and 1 receiver | $25 | AAA cells per detector, stated NOT included. No cell count and no battery life appears |
| CPVAN CP2 Pro motion sensor alarm, 125 dB, 328 ft remote | $25 | Battery operated, stated, with no cell type, no count and no life published. Compare the USB-C siren on this shelf, which can run on permanent power |
A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom, United States. Listed is not the same as in stock — availability changes daily.
Details checked on September 2, 2026.
An existing Ring Alarm household adding a room.
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.
4–5 m (13 to 16 ft) × 110° PIR · 110 dB · 58 melodies, 5 volumes · 20 sensors per receiver
A driveway alarm expandable to twenty sensors on one receiver, with 58 melodies and five volume levels. BITIWEND states a 4 to 5 meter (13.1 to 16.4 ft) detection range across 110 degrees.
Best for: A property with several entrances that should each announce themselves differently.
Standalone PIR · 125 dB · remote control · low-battery warning · not compatible with the CP8
A standalone PIR alarm with a remote, from a maker with a decade in detection. CPVAN states a low-battery warning that ticks periodically, and is explicit that the CP2 does not work with its Wi-Fi CP8.
Best for: A shed, garage or storeroom where the alarm should warn you before its battery dies.
Two sensors and one alarm unit · 300 ft radio to the receiver, detection about 20 ft — both published, and labeled · 38 ringtones with 3 volumes AND A SILENT LED-ONLY MODE, the only silent option on this shelf · 2 sets of mounting screws · AAA not included · not waterproof
The only detector here with a silent mode — a light and no sound — and one of the few that separates its radio range from its detection range on the same page.
Best for: A household with a sleeping baby or a shift worker, where the alert must be visible and not audible
≈ $25
