Shelly BLU Door/Window Mini ZB

Device identification

• Device name: Shelly BLU Door/Window Mini ZB

• Device model: SBDW-203C

• Device Bluetooth ID: 0x0020

Short description

Shelly BLU Door/Window Mini ZB (the Device) is a compact battery-powered sensor for reliable door and window monitoring, designed for long battery life and low-maintenance installation. It detects opening and closing events and also measures the tilt angle - useful for spotting tilted windows or partial openings. Beyond contact status, it adds illumination measurement so your automations can react not only to door or window movement, but also to ambient light conditions. With both Zigbee 3.0 and Bluetooth 5 LE support, it fits well into setups that use either wireless standard.

Main features

• Zigbee 3.0 and Bluetooth 5 LE connectivity, with support for simultaneous Zigbee + Bluetooth operation

• Supports BTHome for compatible Bluetooth-based automations and integrations

• Long battery life for low-maintenance operation

• Door/window inclination angle measurement for detecting tilt/vent positions, not just open/close

• Illumination measurement to trigger automations based on ambient light levels

• Encrypted mode for protected communication

Use cases

• When a door is opened during your “away” schedule, the sensor’s open/close detection can trigger an automation to turn on exterior lights and send an alert. This helps you react quickly to unexpected entry while keeping the automation simple and reliable.

• When a window is tilted the inclination angle measurement can trigger a “ventilation mode” routine instead of treating it like a fully open window. This lets you reduce unnecessary alarms and apply different comfort rules for fresh-air positions.

• When a window is opened a routine can be triggered to close the TRV or stop the AC until the window is closed.

• Stick the sensor on a walk-in closet or pantry door. The light turns on the moment the door is cracked open and shuts off immediately when closed, ensuring the light is never accidentally left on all night.

• If the contact sensor remains open for more than 5 minutes, your smart speaker can play a chime or your hallway light can flash red. This is perfect for ensuring the door to the garage or backyard isn't left wide open by kids or pets.

• If a window stays tilted beyond a set time limit, the reported inclination angle can trigger an automation that reminds you to close it before bedtime. This reduces heat loss and improves peace of mind without requiring you to check every window manually.

• In a high-traffic entry area, the long battery life supports frequent open/close events while still keeping maintenance low. You can use those events to automatically start a hallway lighting scene when the door opens and stop it a few minutes after it closes, improving convenience and saving energy.

Main applications

• Residential: single-family homes, apartments, condominiums

• Light commercial: small office buildings, retail stores, restaurants, gas stations

• Government / municipal: public buildings and facilities

• Educational institutions: universities and colleges

Connectivity and protocols

• Bluetooth

• Zigbee

User interface

One push button

• Press 4 times quickly to put Shelly BLU Door/Window ZB into pairing mode. The LED flashes once every 2 seconds for 1 minute.

• Press 5 times quickly to activate Zigbee pairing. The LED flashes twice every two seconds for 1 minute.

• Press and hold for 30 sec to factory reset.

Specifications

Components and APIs

• This device

• All Shelly devices and services

Compliance

• Shelly BLU Door_Window Mini ZB UK PSTI ACT statement of compliance 330 2026-09-25.pdf

• Shelly BLU Door_Window Mini ZB multilingual EU declaration of conformity 330 2026-09-25.pdf

• Shelly BLU Door_Window Mini ZB UKCA declaration of conformity 330 2026-09-25.pdf

Printed user guide

• Shelly BLU Door Window Mini ZB multilingual printed user and safety guide.pdf