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Shelly BLU Door/Window Outdoor ZB

Shelly BLU Door/Window Outdoor ZB

IP55 shell, Zigbee 3.0 and Bluetooth 5 LE in one sensor, with inclination-angle detection and a five-year coin cell for gates, sheds and outbuildings.

Last recorded price

Launch Year: 2026

Model: SBDW-302C

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Our review

Shelly BLU Door/Window Outdoor ZB Review: A Weatherproof Contact Sensor That Also Reads Tilt

The verdict

The Shelly BLU Door/Window Outdoor ZB is the rugged version of Shelly's dual-radio contact sensor, wrapped in an IP55 shell so it can sit on a gate, a shed or an exterior entrance instead of only indoors. It reports open and closed states and also measures the inclination angle, so a tilted window is distinct from one thrown wide open, and it runs both Zigbee 3.0 and Bluetooth 5 LE at the same time. The trade-offs are the usual ones for the family: it needs a Zigbee coordinator, a Shelly gateway unlocks the app and the voice assistants, it drops the indoor model's ambient light sensor, and there is no Matter or Apple Home path.

Best for
  • Outdoor entry points
  • Gates and sheds
  • Tilt-and-turn windows
  • Zigbee homes
  • Shelly ecosystem owners

Pros

  • IP55 weatherproof housing for gates, sheds and exterior entrances
  • Zigbee 3.0 and Bluetooth 5 LE run simultaneously, so it fits a Zigbee network or a Shelly BLU gateway
  • Reports the inclination angle of turn-and-tilt doors and windows, not just open or closed
  • Five years of battery life from a single CR2032
  • AES-encrypted wireless transmissions
  • Adhesive mounting with no drilling or tools
  • Reaches Google Home, Alexa and SmartThings through the Shelly Smart Control account when a gateway is present

Cons

  • Needs a Zigbee coordinator, and a Shelly gateway for the Shelly app and the voice assistants
  • No ambient light sensor, unlike the indoor BLU Door/Window ZB
  • No Matter certification and no Apple Home path
  • No documented tamper alert; it reports open, close, tilt and battery only
  • Minimum detection distance between sensor and magnet is not published

Who is the Shelly BLU Door/Window Outdoor ZB for?

This sensor suits a home that wants contact monitoring where the indoor units cannot go: a garden gate, a shed door, a garage side entrance or an exterior window. The IP55 enclosure and the -20 C to 40 C working range are what make that possible, and a home that already runs a Zigbee network can pair it to the existing coordinator using the 5-press Zigbee pairing mode. It is also a natural fit for turn-and-tilt windows, because the built-in G-sensor reports the inclination angle rather than collapsing every open state into one, which is the difference between a ventilation-position automation and a false alarm. Anyone already invested in Shelly gear gets a second route: over Bluetooth the unit broadcasts BTHome packets that a Shelly gateway can pick up, and both radios can run at once.

What the Shelly BLU Door/Window Outdoor ZB offers

Two sensing jobs sit in a compact 41 x 28 x 9 mm body that weighs 18 g. A reed switch handles open and close detection, and a G-sensor measures the inclination angle of the door or window, exposed so a controller can tell closed, tilted and fully open apart. Both radios are on board and simultaneous: Zigbee 3.0 on 802.15.4 for a mesh network, and Bluetooth 5 LE broadcasting in the BTHome format for gateway-based setups. Wireless traffic is AES encrypted. Power comes from a single CR2032 rated for up to five years, which matters when the device is mounted somewhere inconvenient, and the battery level is reported so a low cell is visible before the sensor goes quiet. Mounting is adhesive, with foam pads included, so an exterior frame needs no screws or drilling. The companion magnet is a slim 31 x 7 x 7 mm bar that sits beside the sensor.

What to know before you buy

The first thing to plan for is a hub. Zigbee is an end-device protocol, so the sensor joins an existing Zigbee coordinator rather than working on its own, and the Shelly Smart Control app sees it only once a Shelly gateway is on the network, either the BLU Gateway dongle or any Shelly Plus, Pro, Gen3 or Gen4 device that is not itself a sensor. Reaching Google Home, Alexa or SmartThings runs through that same account and gateway. The second is scope: this is the outdoor variant, and it drops the ambient light sensor the indoor BLU Door/Window ZB carries, so there is no illumination reading for light-based automations. There is no Matter certification and no Apple Home path, which rules it out of an Apple-centric setup, and no documented tamper alert, so pulling the sensor off the frame is not reported as an intrusion. The minimum gap at which the magnet triggers the sensor is not published either, so on a badly warped frame it is worth testing the fit before committing to a spot.

Is the Shelly BLU Door/Window Outdoor ZB worth it?

For a Zigbee home that needs monitoring at an exterior door or window, the case is strong. Most outdoor contact sensors compete on weather sealing alone, and this one adds a tilt reading usually found on more expensive units, a five-year battery and a second radio that can broadcast to a Shelly gateway if the setup changes later. The dual radio is the real argument: the same device works as a plain Zigbee sensor today and over BTHome tomorrow, so buying it does not lock in one decision. Where it gives ground is breadth and accessories, since the missing light sensor, the absent Matter path and the reliance on a Shelly gateway for the app narrow what it can do compared with the indoor model. If your hub is a Zigbee coordinator and the goal is a sealed sensor on a gate or shed, the value is easy to see.

Frequently asked questions

Does the Shelly BLU Door/Window Outdoor ZB need a hub?

Yes, in one form or another. Over Zigbee it is an end device, so it joins an existing Zigbee coordinator. Over Bluetooth it broadcasts BTHome packets that need a Shelly gateway to be picked up, either the BLU Gateway dongle or any Shelly Plus, Pro, Gen3 or Gen4 device other than a sensor. The Shelly Smart Control app, and the voice assistants behind it, see the sensor only once that gateway is on the network.

Can it be installed outdoors?

Yes, that is what separates it from the indoor model. It carries an IP55 enclosure and an ambient working range of -20 C to 40 C, so it is built for gates, sheds and exterior entrances. It mounts with the included adhesive pads, so no drilling is required on the frame.

Does it work with Apple Home or Matter?

No. It is a Zigbee 3.0 and Bluetooth 5 LE device with no Matter certification and no HomeKit profile, and Shelly publishes no Apple Home path for its BLU sensors. Google Home, Alexa and SmartThings are reachable instead, through the Shelly Smart Control account, which needs a Shelly gateway on the network.

Can it tell a tilted window from a fully open one?

Yes, and that is its standout feature. A G-sensor measures the inclination angle of the door or window, so a controller can distinguish closed, tilted and fully open states instead of treating every opening the same. That makes ventilation-position automations possible without a false alarm on a cracked window.

How long does the battery last?

Shelly rates the included CR2032 coin cell for up to five years, typical for a low-power Zigbee or Bluetooth end device. The battery level is reported, so a low cell is visible before the sensor stops working. Beacon mode, which broadcasts status periodically, will shorten that life.

Does it have a light sensor?

No. The outdoor model documents open and close detection and inclination-angle measurement only. The indoor Shelly BLU Door/Window ZB is the version that adds an ambient light reading.

At a glance

Summary

Everything this door & window sensor supports, grouped by category.

Size & Materials
Weather Resistance (IP55)Sensor Dimensions (1.6 × 1.1 × 0.4 in, 41 × 28 × 9 mm)Magnet Dimensions (1.2 × 0.3 × 0.3 in, 31 × 7 × 7 mm)Sensor Weight (0.6 oz, 18 g)
Connectivity
BluetoothZigbee (Zigbee Hub required)
Integrations
Google Home (Shelly gateway required)Alexa (Shelly gateway required)Samsung SmartThings (Shelly gateway required)
Sensors
Door & Window Open/Close
Alerts
Door & Window Open/Close AlertsLow Battery Alerts
Features
OTA

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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

IP55

IP55 enclosure rated for exposed outdoor locations such as gates, sheds and exterior entrances, with an ambient working temperature range of -20 C to 40 C.

Sensor Dimensions

1.6 × 1.1 × 0.4 in (41 × 28 × 9 mm)

Magnet Dimensions

1.2 × 0.3 × 0.3 in (31 × 7 × 7 mm)

Sensor Weight

0.6 oz (18 g)

Magnet Weight

?

Power
Battery Type

1x CR2032

Battery Life

5 years

Connectivity
2.4 GHz WiFi

NO

5 GHz WiFi

NO

Bluetooth

YES

Bluetooth 5 (LE), broadcasting in the BTHome format, with simultaneous Zigbee + Bluetooth operation.

Z-Wave

NO

Zigbee

Zigbee Hub required

Zigbee 3.0 end device on 802.15.4, so it joins an existing Zigbee coordinator. The 5-press pairing mode puts it into Zigbee pairing.

Thread Protocol

NO

Other

NO

Integrations
Google Home

Shelly gateway required

Reaches Google Home through the Shelly Smart Control account, and a Shelly gateway is needed for the app to see the sensor (Shelly BLU Gateway, or any Shelly Plus, Gen3 or Gen4 device other than a sensor).

Alexa

Shelly gateway required

Reaches Amazon Alexa through the Shelly Smart Control account, and a Shelly gateway is needed for the app to see the sensor (Shelly BLU Gateway, or any Shelly Plus, Gen3 or Gen4 device other than a sensor).

Apple HomeKit

NO

No Matter certification and no HomeKit profile; the device documents only Bluetooth (BTHome) and Zigbee 3.0, and Shelly offers no Apple Home path for its BLU sensors.

Samsung SmartThings

Shelly gateway required

Reaches SmartThings through the Shelly Smart Control account, and a Shelly gateway is needed for the app to see the sensor (Shelly BLU Gateway, or any Shelly Plus, Gen3 or Gen4 device other than a sensor).

Home Assistant

?

Matter

NO

No Matter certification; the documentation lists only Bluetooth 5 LE (BTHome) and Zigbee 3.0.

Sensors
Door & Window Open/Close

YES

Reed switch for open and close detection, plus a G-sensor that measures the inclination angle of the door or window.

Light

NO

The outdoor model drops the ambient light sensor the indoor BLU Door/Window ZB carries; this unit documents only open/close and inclination angle.

Motion

NO

The G-sensor measures the tilt angle of the door or window, not movement in the room.

Occupancy

NO

Temperature

NO

Alerts
Door & Window Open/Close Alerts

YES

Motion Alerts

NO

Temperature Alerts

NO

Tamper Alerts

NO

Low Battery Alerts

YES

The battery level is reported to the Shelly Smart Control app and broadcast in the BTHome packet, so a low cell is visible before the sensor goes quiet.

Features
Minimum Detection Distance

?

Sensitivity Configuration

?

Automations

YES

Open, close and tilt events trigger scenes and automations, directly between Shelly devices or through the Shelly Smart Control app.

History Records

?

OTA

YES

The BLU line supports over-the-air firmware updates; the process is run from the Shelly mobile app.

Required to work

You need a Zigbee hub for this

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Why it needs a Zigbee coordinator

The Shelly BLU Door/Window Outdoor 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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