# Shelly BLU Door/Window Mini ZB

*Shelly / SBDW-203C*

> The Shelly BLU Door/Window Mini ZB is a compact sensor, 31 mm by 26 mm by 8 mm, for narrow frames. It reports open and close, tilt angle and illuminance over Bluetooth 5 LE and Zigbee 3.0. It suits Home Assistant users, with native support through Zigbee.

- Canonical page: https://smarthomecanon.com/devices/shelly-blu-door-window-mini-zb
- Last checked: 2026-10-20

## Key facts

| Fact | Value |
| --- | --- |
| Brand | [Shelly](https://smarthomecanon.com/brands/shelly) |
| Category | Contact sensor |
| Model numbers | SBDW-203C |
| Status | Current[^1][^2] |
| Type | Door/window sensor[^1][^3] |
| Model code | SBDW-203C[^1][^3] |
| Radio | Bluetooth 5 LE; Zigbee 3.0[^1][^3] |
| Power | CR2032 battery, up to 5 years[^1][^3] |
| Features | Compact sensor (31x26x8 mm); open/close, tilt angle and illuminance[^1][^3] |
| Generation | BLU ZB[^1][^3] |
| BLE advertisements decodable | Yes (BTHome)[^1][^3] |

## Integration paths

**How the Shelly BLU Door/Window Mini ZB connects**

| Path | Requires | Local | Features lost |
| --- | --- | --- | --- |
| [Zigbee](https://smarthomecanon.com/protocols/zigbee) | unknown | unknown | unknown |
| [BLE](https://smarthomecanon.com/protocols/ble) | unknown | unknown | unknown |

**Platform support for the Shelly BLU Door/Window Mini ZB**

| Path | Platform | Support | Integration |
| --- | --- | --- | --- |
| Zigbee | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | withheld | bthome |
| Zigbee | [Homey](https://smarthomecanon.com/platforms/homey) | withheld | cloud.shelly.control |
| BLE | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | Via integration[^1][^3] | BTHome |

## Related pages

- [Shelly BLU](https://smarthomecanon.com/lines/shelly-blu) (line)
- [Shelly](https://smarthomecanon.com/brands/shelly) (brand)
- [Zigbee](https://smarthomecanon.com/protocols/zigbee) (protocol)
- [Bluetooth Low Energy](https://smarthomecanon.com/protocols/ble) (protocol)
- [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) (platform)
- [Homey](https://smarthomecanon.com/platforms/homey) (platform)

## Sources

[^1]: Shelly BLU Door/Window Mini ZB - Shelly Europe shop. https://www.shelly.com/products/shelly-blu-door-window-mini-zb (manufacturer, checked 2026-10-13)
[^2]: Shelly Europe shop catalog (Shopify product feed). https://www.shelly.com/products.json?limit=250&page=1 (manufacturer, checked 2026-10-13)
[^3]: Shelly BLU Door/Window Mini ZB - Shelly Knowledge Base. https://kb.shelly.cloud/knowledge-base/shelly-blu-door-window-mini-zb (manufacturer, checked 2026-10-13)