# Meross MS405H Matter Smart Water Leak Sensor

*Meross / MS405H, MS405HMA, MS405*

> The Meross MS405H Matter Smart Water Leak Sensor is a water leak sensor with probes on the top and bottom and a 100 dB alarm. It connects through the Meross MSH450 hub, which makes it available to HomeKit, Alexa, Google Assistant and SmartThings over Matter. It suits HomeKit, Google Home, Alexa and SmartThings users, with native support through a Matter bridge. Home Assistant users reach it through an integration (a Matter bridge).

- Canonical page: https://smarthomecanon.com/devices/meross-ms405h
- Last checked: 2026-10-20

## Key facts

| Fact | Value |
| --- | --- |
| Brand | [Meross](https://smarthomecanon.com/brands/meross) |
| Category | Leak sensor |
| Model numbers | MS405H, MS405HMA, MS405 |
| Status | Current[^1] |
| Type | Water leak sensor[^1] |
| Standard | Matter bridge[^1] |
| HomeKit | Via hub[^1] |
| Power | 2 AAA batteries[^1] |
| Connects through | Meross hub[^1] |
| Sold in | US, EU, UK and AU[^1] |

## Integration paths

**How the Meross MS405H Matter Smart Water Leak Sensor connects**

| Path | Requires | Local | Features lost |
| --- | --- | --- | --- |
| [Matter via Bridge](https://smarthomecanon.com/protocols/matter-bridged) | A Matter controller, Meross Matter Smart Hub MSH450MA[^1] | unknown | unknown |

**Platform support for the Meross MS405H Matter Smart Water Leak Sensor**

| Path | Platform | Support | Integration |
| --- | --- | --- | --- |
| Matter via Bridge | [HomeKit](https://smarthomecanon.com/platforms/homekit) | Native[^1] |  |
| Matter via Bridge | [Amazon Alexa](https://smarthomecanon.com/platforms/alexa) | Native[^1] |  |
| Matter via Bridge | [Google Home](https://smarthomecanon.com/platforms/google-home) | Native[^1] |  |
| Matter via Bridge | [Samsung SmartThings](https://smarthomecanon.com/platforms/smartthings) | Native[^1] |  |
| Matter via Bridge | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | withheld |  |

## Related pages

- [Meross hubs, sensors and smoke alarm](https://smarthomecanon.com/lines/meross-hubs-and-sensors) (line)
- [Meross](https://smarthomecanon.com/brands/meross) (brand)
- [Matter through a bridge](https://smarthomecanon.com/protocols/matter-bridged) (protocol)
- [HomeKit](https://smarthomecanon.com/platforms/homekit) (platform)
- [Amazon Alexa](https://smarthomecanon.com/platforms/alexa) (platform)
- [Google Home](https://smarthomecanon.com/platforms/google-home) (platform)
- [Samsung SmartThings](https://smarthomecanon.com/platforms/smartthings) (platform)
- [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) (platform)

## Sources

[^1]: Meross Matter Smart Water Leak Sensor Kit, MS405HMA - Meross Official Store. https://shop.meross.com/products/smart-water-leak-sensor-ms405 (manufacturer, checked 2026-10-16)