Pet immunity is a stated weight limit, and it is measured at floor level · review
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.
The conclusion Two detectors onto one receiver with thirty-eight tones, three volumes and — alone on this shelf — a silent LED-only mode, which is the right alert for a care alarm or a back gate in a house with a sleeping child. It is also one of the clearest pages here: twenty feet of detection and three hundred feet of radio, published together and distinguished, plus real placement advice about wind and branches. No angle, no pet immunity, and the cells are not supplied.
No field of view. No pet immunity. No battery life.
And a lot of what these are used for is not security.
BESTOONE names it: a doorbell, a care alarm, a wildlife warning.
An LED that lights when the back gate opens tells a parent in the next room without waking a baby. A hundred and twenty-five decibels does not.
Every other product on this shelf either makes a noise or is silent and reports somewhere else. This is the only quiet local alert.
The three volume levels are still there when the use changes.
Which is the clearest handling of those two figures on this shelf.
Twenty feet is what the sensor sees. Three hundred is how far the signal reaches the receiver.
Three listings here put a radio distance in their titles. One publishes no detection range at all.
Twenty feet is short for a room from a corner — thirty and thirty-two appear elsewhere here. It is published, which is worth more.
Which is real, and which only two listings here mention.
A PIR sees moving warmth. A sunlit branch swaying in and out of shade is a moving heat source. So is a curtain lifting over a radiator.
BESTOONE says to keep the field clear of obstructions such as trees, and not to place it where wind will set it off.
This shelf’s buying tip agrees: placement fixes more false alarms than sensitivity settings do.
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 | 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 |
|---|---|
| Range | 300 ft from the sensor to the receiver — stated as the signal transmission distance, not a sensing distance |
| Modes | 38 ringtones, three volume levels — low, medium, high — and a SILENT MODE giving an LED warning with no sound. The silent option is unique on this shelf: every other product here either sounds or does nothing |
| Supplied | Two motion detectors, one alarm unit and two sets of mounting screws — stated. AAA cells are needed and not included |
| Applications | Named as a doorbell, garage alarm, intruder warning, burglar warning, wildlife warning and child or elderly care alarm, at front doors, window frames, driveways and walkways |
| Power | AAA cells per detector, stated NOT included. No cell count and no battery life appears |
| Ratings | Explicitly not waterproof: avoid the rain for installation, stated |
| Placement | BESTOONE names two causes of false alarms and what to do: do not place the detector where wind will set it off, and keep the detection field clear of obstructions such as trees. It is the only listing on this shelf besides the wired detector to give placement advice |
| Pet immunity | Not published, in any form. No weight, no sensitivity and no mention of animals |
| Field of view | Not published |
| Amazon reference | B09TPCL1ZJ |
| EAN | 0768494423186 |
Because a lot of what these detectors get used for is not security. BESTOONE names it: a doorbell, a child or elderly care alarm, a wildlife warning. An LED that lights when the back gate opens tells a parent in the next room without waking a baby; a 125 dB siren does not. Every other product on this shelf either makes a noise or is silent in itself and reports elsewhere, so this is the only one with a quiet local alert. The three volume levels are still there when the use changes.
For a doorway, a hallway or a garage, yes. For a room you want covered from one corner, it is on the short side — thirty feet and thirty-two feet appear elsewhere on this shelf, and 7 meters (23 ft) on another. What makes the twenty-foot figure worth more than its size is that it is published, and published in the same sentence as the 300 ft radio range so the two cannot be confused. One listing on this shelf publishes no detection range at all, and three put a radio distance in their titles.
Take it seriously, because it describes a real failure. BESTOONE says not to place the detector where wind will make it active and to keep the field clear of obstructions such as trees — and this shelf's introduction explains why: a PIR sees moving warmth, so a sunlit branch swaying in and out of shade is a moving heat source, and so is a curtain lifting over a radiator. This shelf's buying tip agrees that placement fixes more false alarms than sensitivity settings do. Only two listings on this shelf offer any placement advice at all.
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 |
|---|---|---|---|
| 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 |
| 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 |
| 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 household with a sleeping baby or a shift worker, where the alert must be visible and not audible
Amazon reports what buyers took in the month before this page was last checked: at least 50.
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.
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.
32 ft (10 m) × 110° · pet immune to 55 lb (25 kg), the only stated weight limit on this shelf · voltage-free NC/NO dry contact for a wired panel · DC 9–16 V, 12 V recommended · J1 pulse count, J2 contact mode, J3 LED · mount at 7.2 ft, the only mounting height on this shelf · 2.1 × 4.1 × 1.4 in · −10 to +50 °C (122 °F) · automatic temperature compensation
The only detector here that wires into an alarm panel — and the best-specified product on the shelf by a distance.
Best for: A wired alarm panel, where a voltage-free contact and a jumper for pulse counting are the whole requirement
≈ $14
