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The most useful smart-home upgrade is sometimes the one that stops doing something annoying. Lights that go dark while you are reading, for example. A conventional motion sensor can be excellent at noticing someone entering a room and much less helpful once that person settles into a chair. Presence sensing promises a better answer: automate around whether a space is occupied, not simply whether someone just walked through it.
Shelly’s Presence Gen4 is interesting because it combines that idea with unusually flexible ways to connect it. At the US store’s listed $84.99, it sits in considered-purchase territory rather than impulse-buy territory. Its strongest case is not a spectacular maximum detection figure. It is the prospect of using room-level and zone-level information in a home whose lights and automation software are not all from one manufacturer.
That distinction matters if you have been comparing it with Aqara’s FP400 or FP2. All three can lead to more useful automations. The better purchase depends on where you want to configure those automations, how much setup you will tolerate, and whether the right connection exposes the features you are buying.
Buy it for a room with a specific problem
An open-plan living area makes the appeal easy to understand. A person at the desk may want a different lamp from someone sitting on the sofa. Treating the whole room as one occupied area cannot express that distinction. Splitting it into useful zones can.
Shelly specifies up to ten configurable detection zones. That is enough to separate several meaningful areas without turning the floor plan into a project of its own. The important word is meaningful. More zones do not automatically produce better lighting. A sensible starting point is a desk, a seating area and a route through the room, with each assigned a clear purpose.
The same logic helps decide whether you need this product at all. For a cupboard or a hallway where entering and leaving are the only important events, a simpler motion sensor may already do the job. Presence Gen4 makes more sense where people remain still, multiple activities share a room, or an existing motion-triggered routine regularly gets the household wrong.
This is also a more focused proposition than adding another camera. There is no need to capture a view of the room merely to decide whether a desk lamp should remain on. It does not replace a security camera or explain what happened during an incident; it supplies a different kind of information for a different job.
The connection is part of the product
The feature list includes Wi-Fi 6, Bluetooth LE, Zigbee and Matter over Wi-Fi. Those names deserve to be read carefully rather than treated as interchangeable badges. In particular, Matter over Wi-Fi is not Matter over Thread. A buyer choosing equipment around an existing Thread network should not assume this sensor joins that network just because it carries a Matter logo.
The default Matter-over-Wi-Fi firmware and the alternative Zigbee firmware are separate operating choices, not protocols running simultaneously. Switching to Zigbee requires the appropriate firmware and a compatible Zigbee coordinator. Choose that route deliberately rather than assuming every connection option remains available at once.
The embedded web interface is an important part of Shelly’s appeal. There is a direct device-configuration route in addition to the company’s app. For people who already maintain a local smart-home system, that is often more valuable than another polished cloud dashboard: the sensor can become part of the system they have chosen rather than a reason to replace it.
Home Assistant’s official Shelly integration describes local communication and supports the company’s device generations. That supports the broader case for Shelly in a locally controlled home. It should not be stretched into a promise that every advanced radar display or every firmware feature will appear identically in every integration. The practical buying question remains specific: can your intended platform see the occupancy information you need, and can it use that information to control your actual lights?
A good local setup should also be understood end to end. A sensor operating locally does not make an unrelated cloud-only bulb work through an internet outage. The sensor, automation controller and controlled device all have to fit the plan. This is a reason to sketch one intended routine before ordering, not a reason to abandon a useful product.
Matter zones are worth checking, not assuming
Shelly’s documentation says a Matter-compatible system initially shows one room zone. Additional configured zones can appear as separate components, up to ten. That is a meaningful detail for a buyer who wants more than a single occupied-or-empty signal outside the manufacturer’s own app.
It also explains why a quick pairing test can be misleading. Seeing one presence sensor after adding the device does not necessarily demonstrate that multi-zone support is absent. Conversely, a list of supported protocols is not proof that the preferred platform presents the entire room map or every tuning control. Configuration and day-to-day automation are related but distinct jobs.
For a straightforward installation, keep those jobs separate. Configure the room accurately, then check the destination platform’s actual zone entities before building elaborate routines. Start with a lamp whose behavior is easy to observe. Once the result is predictable, add another zone or a second condition. This keeps a small placement mistake from becoming a house-wide automation mystery.
The attraction here is flexibility, not freedom from setup. If you enjoy improving a Home Assistant installation, that trade can be entirely reasonable. If the desired experience is plugging in a sensor and never thinking about it again, the tuning process belongs in the purchase decision alongside the price.
Placement and power deserve a place in the budget
Shelly provides a freestanding base and supports fixed mounting. The product’s compact shape is useful for a shelf or a wall, but choosing a discreet location is only half the job. It still needs a suitable view of the area you want to detect and a practical route for continuous power.
The specified supply is 5 V, 1 A over USB-C. Shelly explicitly recommends a dedicated, stable power adapter and warns against unsuitable multi-port or fluctuating fast-charging arrangements. That makes the spare charger drawer worth checking before purchase. A convenient-looking USB socket is not automatically the right supply for a device expected to run continuously.
The company specifies still-presence detection up to 3 m, distinct from its broader coverage figures. Its installation guidance recommends a mounting height of 2 m and a downward tilt of 15 degrees. These are manufacturer specifications and setup guidance, not distances verified in this review. This is a good reason not to buy by the largest room-area number alone. A reading chair across the room is a different sensing problem from someone walking nearby. Before committing to a permanent mounting position, the useful question is whether the proposed location covers the seated activities that motivated the purchase.
There is a small design compromise here: better placement may be less invisible. A sensor hidden behind objects is aesthetically tidy but not necessarily helpful. A visible device with an orderly cable can be the better solution if it reliably serves the space. The base gives some room to experiment before making a fixed installation permanent.
Software changes are part of the buying decision
Presence sensing is not just a piece of radar hardware. Shelly’s web-interface guide exposes controls for sensitivity and more advanced tuning, including thresholds that trade sensitivity against unwanted detections. Those options are useful precisely because rooms are not identical.
They should not become a requirement to adjust every setting on day one. Establish the room layout and test a simple routine first. Advanced controls are most valuable when they address an observed problem. Changing several at once makes it harder to learn which adjustment helped.
Recent official firmware notes show why older impressions need context. The version 2.0.1 release notes dated September 23, 2026 included changes to light-sensor stability, radar presets, Matter illuminance reporting and overheating protection. These are documented software changes, not proof that every installation is now perfect. They do, however, make the firmware version a worthwhile question when comparing experiences from different months.
There is also an unresolved documentation mismatch worth keeping in proportion. The current US documentation page refers to tracking up to ten people in its feature copy, while the technical table on that same page lists six objects or people. This is a current documentation inconsistency, not evidence that a particular firmware update changed the limit. Rather than treat either number as a measured result, this review would not make maximum headcount the deciding factor. Buyers designing around a crowded shared space should confirm the applicable firmware capability with Shelly. A household choosing a sensor for a desk and sofa has more immediate questions to settle.
Shelly versus Aqara FP400 and FP2
The Aqara FP400 comparison is especially useful because it exposes a common smart-home purchasing mistake: buying the most impressive sensor without checking the route to its best features.
Aqara’s FP400 supports up to eight custom zones configured in Aqara Home. A compatible Aqara hub is one route, but not the only one: Aqara’s September 16 announcement describes setup without its own hub using an existing compatible third-party Thread Border Router. Its technical guide explains local app configuration followed by sharing up to eight configured zones to a compatible Matter platform. The important restriction is the setup sequence. Pairing directly to a third-party platform without first configuring the device in Aqara Home does not provide custom zones. However, Aqara’s product page still attaches hub requirements to some zone-sharing descriptions. Its documentation is not fully consistent, so verify the actual firmware, app and target-platform combination before relying on the no-Aqara-hub route. Check the requirements of the target platform rather than budgeting for an Aqara hub automatically.
Shelly’s appeal is therefore not that it wins every sensing specification. It offers a different arrangement for someone prioritizing a local web interface and configurable zones exposed through Matter over Wi-Fi rather than Thread. Neither brand has an exclusive claim to cross-platform zone sharing without its own hub. That can make it a better fit even when another sensor advertises more ambitious hardware. The distinction is practical: which route gets the information into the system you actually use?
The FP2 remains relevant too. Aqara advertises up to thirty zones, and its documentation describes local automations with compatible Aqara or Apple Home devices. More zones can be useful in a detailed layout, but counting them is not a substitute for deciding which areas require different behavior. A room with three useful lighting zones does not become better automated merely because the sensor can define thirty.
For someone happy with an existing FP2 installation, the Shelly feature list alone is not a compelling replacement argument. A change makes more sense when it solves a specific integration, placement or workflow problem. For a new installation, choose the ecosystem and required zone behavior first; compare hardware second.
Who should spend the money?
Presence Gen4 is most convincing for an owner who can name the automation they want and values control over how it works. A local-first smart home, an open-plan room with different activities, or a Shelly installation that needs more informative occupancy sensing are sensible starting points. The combination of a web interface, multiple connection options and configurable zones gives it room to grow beyond a single light switch.
It is less persuasive as an expensive cure for an undefined smart-home frustration. Someone who needs only an entry trigger can often choose a simpler sensor. Someone already satisfied with Aqara’s advanced setup may gain little by introducing another configuration environment. And anyone unwilling to spend time on placement should avoid treating radar as a guarantee of effortless automation.
The best buying argument is modest but useful: a room that responds more appropriately to the people in it. Not every home needs that level of control. In the right room, however, it is a tangible improvement, and Shelly gives an enthusiast several ways to build it without making one vendor’s app the whole system.
The US Shelly Presence Gen4 purchase page listed $84.99 and in-stock availability when checked on November 11, 2026; price and availability may change. Choose it for the integration and room behavior you need, leave some time for setup, and resist choosing any presence sensor on its biggest advertised number alone.
11/11/2026
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