Shelly BLU Motion ZB

Shelly BLU Motion ZB

4.4
21 ratings
Launch Year: 2026

Model: SBMO-103Z

$26.99
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Our review

Shelly BLU Motion ZB Review: A Tiny Dual-Radio Motion Sensor That Trades Lux Numbers for Zigbee

Zigbee 3.0 and Bluetooth 5 LE running side by side, fast PIR detection and a five-year battery, but the light sensor reports three coarse levels instead of a lux value.

The verdict

The Shelly BLU Motion ZB is a very small, battery-powered PIR and light sensor whose defining trick is dual connectivity: it can sit on a Zigbee 3.0 network and broadcast BTHome over Bluetooth at the same time, so a Zigbee hub and Home Assistant can both read it. Owners consistently praise how quickly it detects movement, how easy the Zigbee pairing is (five presses of the single button) and how long the included CR2477 should last. The catch is the light sensor: it reports only dark, twilight and bright against thresholds you set, not a numeric lux reading, and the people who wanted a brightness curve say so loudly. If you already run Shelly or Zigbee hardware and want a discreet indoor sensor for light-aware lighting automations, it is a strong, inexpensive pick, as long as you do not need the exact lux figure.

Best for
  • Existing Shelly households
  • Zigbee smart home setups
  • Home Assistant users
  • Discreet indoor motion sensing
  • Light-aware lighting automations

Pros

  • Zigbee 3.0 and Bluetooth 5 LE run simultaneously, so a Zigbee hub and a BTHome listener can both read it
  • Very small and discreet, mounted anywhere with the included adhesive and no tools
  • Fast, reliable PIR detection with three sensitivity levels and a configurable hold time
  • Included CR2477 battery rated for five years and easy to replace
  • Works with Home Assistant, which handles this exact model over Zigbee2MQTT and reads its BTHome broadcast natively

Cons

  • The light sensor reports only dark, twilight and bright, never a numeric lux value, which owners of the previous model call a regression
  • Useless on its own: Zigbee needs a compatible hub and Bluetooth needs a Shelly BLU Gateway or a Shelly Plus, Pro, Gen3 or Gen4 device
  • Alexa only sees the motion state, so exposing the light level there takes virtual components in the Shelly app
  • No Matter certification and no Apple Home path, since the device speaks only Bluetooth and Zigbee
  • Indoor only: no IP rating, and a narrow rated ambient temperature and humidity range

Who is the Shelly BLU Motion ZB for?

This is the Zigbee sibling of Shelly BLU Motion, and the ZB in the name is the whole point: alongside Bluetooth 5 LE it carries a Zigbee 3.0 radio, joins an existing Zigbee coordinator as an IAS Zone motion sensor and can run both radios simultaneously. It is aimed at people who already have a Zigbee hub or Shelly gear and want a cheap, almost invisible indoor sensor to drive lighting: a 37 mm square that sticks to a wall or ceiling with the included adhesive, runs about five years on one CR2477 and pairs in seconds. It is not a standalone product. Without a Zigbee hub or a Shelly Bluetooth gateway it has nothing to report to, and it is strictly an indoor device, so anyone wanting weatherproof outdoor detection or a precise brightness readout should look elsewhere.

What buyers love

Setup comes up first and almost unanimously: owners describe pressing the button five times for Zigbee pairing and having it working immediately, with several calling the installation the easiest part of the job. Detection speed is the next theme, with reports of near-instant response to movement, and the size gets repeated praise, small enough that owners tuck it into a drawer, a pantry or a cupboard as well as mounting it in a hallway. The battery impresses people too: it is physically large, it is included, and it can be swapped without prising the case apart. Several owners run it in Home Assistant over Zigbee and Bluetooth at once and report that it works well on both. One owner replaced a set of Homematic sensors with these specifically to fold motion into the Shelly automations already running, and highlights that pairing motion with the light reading is what makes those automations worth building, since lights only come on when the room is genuinely dim.

What to know before you buy

The complaint that dominates the negative reviews is the light sensor. It does not publish a lux number: it reports one of three states, dark, twilight or bright, with the thresholds between them configurable in lux. Owners upgrading from the earlier BLU Motion treat that as a step backwards, because they can no longer chart the brightness over the day, and at least one bought it purely for that and could not use it. Read as a motion sensor with a light-based condition it is fine, read as a lux meter it will disappoint. Beyond that, the gateway requirement is real: Zigbee control needs a compatible hub and Bluetooth control needs a Shelly BLU Gateway or a Shelly Plus, Pro, Gen3 or Gen4 device, and the voice assistants reach it through the Shelly account rather than directly. One owner notes that Alexa in particular only sees whether motion is present and not the brightness state, which takes virtual components in the Shelly app to work around. Finally, Shelly does not publish a detection angle or a detection range for this model, and the specifications describe an indoor product with no IP rating, so plan the placement accordingly.

Is the Shelly BLU Motion ZB worth it?

For a Shelly or Zigbee household, yes. It is inexpensive, it is the smallest sensor most people will mount, it responds fast, it has three sensitivity levels and a configurable hold time to tune out pets and lingering movement, and the dual radio means you are not locked into one path: the same unit can feed a Zigbee hub and a BTHome listener at once. Home Assistant support is solid, with this exact model handled by Zigbee2MQTT and its BTHome broadcast readable natively. What you give up is the numeric brightness reading the previous generation offered and any Matter or Apple Home route, since the device speaks only Bluetooth and Zigbee. If those are not on your list, it is one of the easiest and cheapest ways to add motion and a usable light condition to an existing setup.

Frequently asked questions

Does the Shelly BLU Motion ZB need a hub?

Yes. It is an end device on both of its radios. Over Zigbee it joins an existing Zigbee 3.0 coordinator, and for Bluetooth control through the Shelly Smart Control app it needs a Shelly BLU Gateway or any Shelly Plus, Pro, Gen3 or Gen4 device acting as the bridge. On its own it only broadcasts, with nothing listening.

Does it report the actual lux level?

No. The built-in light sensor reports one of three coarse levels, dark, twilight or bright, and what you can configure is the lux threshold between them (50 lx and 500 lx by default). That is enough to trigger lights only when a room is dim, but it will not give you a brightness value to chart, and that is the single most common complaint from owners who upgraded from the earlier Bluetooth-only model.

Can it use Zigbee and Bluetooth at the same time?

Yes, and that is its main advantage over the Bluetooth-only original. The specifications state simultaneous Zigbee plus Bluetooth operation, so the sensor can be bound to Zigbee devices while still broadcasting its readings in the BTHome format, and owners confirm running both paths together.

Does it work with Home Assistant?

Yes. Zigbee2MQTT supports this exact model and exposes occupancy, battery, the battery-low flag, the light level, both lux thresholds and the motion sensitivity. Home Assistant also reads BTHome natively, so the Bluetooth side works without the Zigbee network at all, provided something is receiving the broadcast.

Can I use it outdoors?

It is not designed for it. Shelly rates it for -20 to 40 degrees Celsius and 30 to 70 percent relative humidity and publishes no IP rating, and it is fixed with double-sided adhesive. For anything exposed to rain, choose a weatherproof sensor instead.

How long does the battery last and can I change it?

It runs on a single 3 V CR2477 cell, included in the box, rated for about five years. Owners note that the cell is a common and inexpensive one and that it can be swapped without damaging the housing, which is not true of every sensor this size.

At a glance

Summary

Everything this motion sensor supports, grouped by category.

Size & Materials
1.5 × 1.5 × 1.1 in (37 × 37 × 28 mm)1 oz (28 g)
Connectivity
BluetoothZigbee (Zigbee Hub required)
Integrations
Google Home (Shelly gateway required)Alexa (Shelly gateway required)Samsung SmartThings (Shelly gateway required)Home Assistant
Sensors
MotionLight
Alerts
Motion AlertsLow Battery Alerts
Features
Motion Sensitivity ConfigurationDetection Timeout Configuration

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Company
Shelly logo

Shelly

4.4/ 5 avg ratingBulgaria flagHeadquartered in Bulgaria

Shelly, based in Bulgaria, makes compact smart relays, switches, plugs and sensors that fit behind existing wall switches and outlets to automate almost any home wiring. Its devices are popular with advanced users for offering local control, a built-in web interface, MQTT and broad integration with Home Assistant, Alexa and Google Home. Shelly is a favorite for retrofitting smart control without replacing fixtures.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Size & Materials
Weather Resistance

NO

Indoor device: the specifications state an ambient range of -20 to 40 degrees Celsius and 30 to 70 percent RH, with no IP rating, and it is mounted with double-sided adhesive.

Dimensions

1.5 × 1.5 × 1.1 in (37 × 37 × 28 mm)

Weight

1 oz (28 g)

Power
Battery Type

1x CR2477

Battery Life

5 years

Connectivity
2.4 GHz WiFi

NO

5 GHz WiFi

NO

Bluetooth

YES

Bluetooth 5 (LE) broadcasting in the BTHome format, running simultaneously with Zigbee. Remote control needs a Shelly BLU Gateway or a Shelly Plus, Pro, Gen3 or Gen4 device as the bridge.

Z-Wave

NO

Zigbee

Zigbee Hub required

Zigbee 3.0 end device (IAS Zone 0x000D, profile 0x104, 802.15.4), so it joins an existing Zigbee coordinator.

Thread Protocol

NO

Integrations
Google Home

Shelly gateway required

Reaches Google Home through the Shelly Smart Control account, and the product page states that a compatible Bluetooth or Zigbee gateway is required for automations and app control.

Alexa

Shelly gateway required

Reaches Amazon Alexa through the Shelly Smart Control account, and the product page states that a compatible Bluetooth or Zigbee gateway is required for automations and app control.

Apple HomeKit

NO

The device documentation lists only Bluetooth 5 LE and Zigbee 3.0, with no Matter or HomeKit profile, and Shelly's compatibility page names only Alexa, Google Home and SmartThings.

Samsung SmartThings

Shelly gateway required

Reaches SmartThings through the Shelly Smart Control account, and the product page states that a compatible Bluetooth or Zigbee gateway is required for automations and app control.

Home Assistant

YES

Zigbee2MQTT supports this exact model (SBMO-103Z), exposing occupancy, battery, battery low, light level, the dark and bright thresholds and motion sensitivity. Over Bluetooth it also broadcasts BTHome, which Home Assistant reads natively.

Matter

NO

Not in the CSA certified-product database under Shelly Europe Ltd., and the device documentation lists only Bluetooth 5 LE and Zigbee 3.0.

Sensors
Motion

YES

PYD1698 passive infrared (PIR) motion sensor.

Light

YES

Built-in lux sensor reporting three levels (dark, twilight, bright) with configurable thresholds, 50 lx dark and 500 lx bright by default.

Temperature

NO

The specifications list only a PIR and a light sensor.

Alerts
Motion Alerts

YES

Every motion detection is broadcast as an event over BTHome and sent over Zigbee to the bound devices, and the app can push a notification when movement is detected.

Low Battery Alerts

YES

IAS Zone status bit 3 flags a battery at or below 15 percent, and the battery percentage is also broadcast over BTHome.

Features
Angle of Detection

?

Range of Detection

?

Motion Sensitivity Configuration

YES

Three PIR sensitivity levels (low, medium, high), adjustable to cut false triggers from pets or distant movement.

Detection Timeout Configuration

YES

Motion hold time is configurable in seconds (60 by default): while movement continues the timer restarts, and a motion clear event is emitted once it expires.

Automations

YES

Motion and light-level events trigger scenes and automations from the Shelly Smart Control app, and scripting is available through a gateway.

History Records

?

Required to work

You need a Zigbee hub for this

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Why it needs a Zigbee coordinator

The Shelly BLU Motion ZB speaks Zigbee, not Wi-Fi. On its own it cannot reach your phone, your voice assistant or any automation: it needs a Zigbee coordinator to join. These are the ones in our catalog that can run it.

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