Pet immunity is a stated weight limit, and it is measured at floor level · review
The only listing on this shelf that tells you a PIR cannot see through glass — which is the commonest way these are installed wrongly.
The conclusion Twenty-five dollars, 125 decibels, a chime mode and a remote — and the one sentence on this shelf that will save a wasted purchase: a PIR does not detect motion through walls, windows or glass doors. It also publishes a working range alongside the maximum, 10 to 26 feet of a claimed 40, which no other listing here does. It gives no field of view angle, no battery detail and no siren duration, all of which its direct rival publishes at the same price.
No field of view angle. No cell type. No battery life. No pet weight. No siren duration.
Which is the sentence nobody else on this shelf writes.
A PIR senses long-wave infrared from a warm body. Ordinary window glass is opaque to that wavelength.
So a detector on an inside windowsill pointed at a drive sees a perfectly still scene, no matter who crosses it. The same goes for a glass door and a porch window.
If outdoor coverage is the requirement, the sensor has to be outdoors — and this one is stated not waterproof.
One sentence, and it prevents the commonest wasted purchase in this family.
Both, honestly.
Forty is what the sensor does for a warm body crossing the full field in ideal conditions. Ten to twenty-six is where it works, which CPVAN publishes as best performance.
Every PIR on this shelf has that gap. This is the only listing that admits it.
The detector here claiming thirty-two feet and the one claiming sixteen to twenty-six are probably not far apart in practice.
Plan on the lower figure.
Which is half the geometry missing.
At least four of the thirteen detectors on this shelf publish a field of view, from a hundred to a hundred and twenty degrees.
This publishes a distance and no angle, so you cannot tell whether twenty-six feet is a corridor or a room.
Same price, same 125 decibels, same 328 ft remote.
The other one publishes a 120° field, a two-minute siren duration, three volume levels and a USB-C power option.
This one publishes the truth about glass, a two-tier range, and an eighteen-month warranty.
Settled installation: take the rival. Still working out where a PIR can see: this page teaches more.
On sale at around $25 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.
| Detection | Up to 40 ft, with best performance typically within 10–26 ft — stated, and that qualification is the most useful sentence on this shelf. A PIR's rated maximum is a laboratory figure for a warm body crossing the field; the working range is always shorter, and CPVAN is the only listing here that publishes both numbers |
|---|---|
| Limitations | PIR sensors do not detect motion through walls, windows or glass doors — stated outright. No other listing on this shelf says it, and it is the commonest installation error: a detector pointed through a window at a drive sees nothing at all, because glass blocks the long-wave infrared a PIR works on |
| Volume | 125 dB, stated, tied with the loudest on this shelf |
| Modes | Two: loud alarm mode for security and chime mode for gentle notifications — stated, switchable from the remote |
| Remote | Included, working up to 328 ft in open areas, to arm, disarm or switch modes from a distance. NOTE: 328 ft is the REMOTE'S range, not the detection range |
| Power | 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 |
| Mounting | Adhesive sticker or screws, or placed on a table, shelf or inside a vehicle — stated. Named for garages, vans, camping trips, sheds, shops and boats |
| Field of view | NOT published. At least four of the thirteen detectors on this shelf publish an angle, running from 100° to 120°; this one publishes a distance and no angle, which leaves half the geometry unknown |
| System | No app, hub or Wi-Fi required — stated, with an 18-month warranty and lifetime technical support |
| Pet immunity | Not published as a weight. CPVAN states PIR sensing that helps identify human movement and reduce unwanted triggers, which is an adjective |
| Amazon reference | B07MK2VRRQ |
| EAN | 0784237296312 |
Because it is the way these detectors are most often installed wrongly, and CPVAN is the only maker on this shelf that says so. A PIR works by sensing long-wave infrared from a warm body, and ordinary window glass is opaque to that wavelength — so a detector sitting on an inside windowsill pointed at a drive sees a perfectly still scene no matter who walks across it. The same applies to a glass door and to a porch window. If outdoor coverage is the requirement, the sensor has to be outdoors, and this one is stated not waterproof.
Both, honestly reported. Forty feet is what the sensor can do for a warm body crossing the full field in ideal conditions; ten to twenty-six feet is where it works reliably, which is what CPVAN publishes as best performance. Every PIR on this shelf has the same gap between rated and working range and this is the only listing that admits it — the detector claiming 32 feet and the one claiming 16 to 26 are probably not far apart in practice. Plan the installation on the lower figure and treat the maximum as a limit, not a promise.
An angle, a siren duration and a volume choice. The other 125 dB remote-controlled siren on this shelf publishes a 120-degree field of view, a two-minute alarm duration, three volume levels and a USB-C power option, at the same twenty-five dollars. What this one has instead is the honesty about glass and the two-tier range figure, plus an eighteen-month warranty. If the installation is settled and you want specifications, take the rival; if you are still working out where a PIR can and cannot see, this page teaches you more.
Between security devices of the same category and nearby price. Shown: what they all state. A half-filled column says nothing.
| Model | Price | Detection | Pet immunity |
|---|---|---|---|
| CPVAN CP2 Pro motion sensor alarm, 125 dB, 328 ft remote | $25 | Up to 40 ft, with best performance typically within 10–26 ft — stated, and that qualification is the most useful sentence on this shelf. A PIR's rated maximum is a laboratory figure for a warm body crossing the field; the working range is always shorter, and CPVAN is the only listing here that publishes both numbers | Not published as a weight. CPVAN states PIR sensing that helps identify human movement and reduce unwanted triggers, which is an adjective |
| BESTOONE MSA-21 motion sensor alarm, 2 sensors and 1 receiver | $25 | About 20 ft of infrared detection distance — stated, and stated in the SAME bullet as the 300 ft radio range and distinguished from it. That is the clearest handling of the two figures on this shelf, where three listings lead with a radio distance and one publishes no detection range at all | Not published, in any form. No weight, no sensitivity and no mention of animals |
| eufy Security T8910021 motion sensor, 100° × 30 ft | $25 | 100° field of view up to 30 ft — stated as more than enough to secure an entire room. Thirty feet is the longest range among the app-based sensors on this shelf, and a hundred degrees is the narrowest angle published on this shelf, against the hundred and ten of the wired panel detector here and two others at a hundred and twenty | NOT published as a weight. eufy states adjustable sensitivity so that it only alerts when humans are in range rather than a playful pet dog or cat — which is a setting, not a limit. This shelf's introduction and this shelf's tag both say pet immunity is a stated weight, and only at least one of the thirteen detectors here gives one |
| TECKNET HHA01001WA01 indoor motion sensor alarm, 125 dB, 328 ft remote | $25 | Approximately 16–26 ft over a 120° field of view — stated, with the caveat that range varies with installation height, angle and environment. The body rotates 360° so the field can be aimed down a hallway without moving the mount | Not published as a weight. TECKNET states PIR sensing with intelligent signal analysis to distinguish human movement from environmental interference, which is an adjective where this shelf asks for a figure |
Details checked on October 8, 2026.
A shed, a boat or a van where the limitation matters more than the headline, and nothing needs an app
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
