# YoLink Water Leak Sensor 1

*YoLink / YS7903*

> The YoLink Water Leak Sensor 1 (YS7903) is a battery-powered puck leak sensor in an IP68 housing for indoor use. It suits Alexa users, with native support through the maker's hub. Home Assistant users reach it through an integration (the maker's hub).

- Canonical page: https://smarthomecanon.com/devices/yolink-water-leak-sensor-1
- Last checked: 2026-10-20

## Key facts

| Fact | Value |
| --- | --- |
| Brand | [YoLink](https://smarthomecanon.com/brands/yolink) |
| Category | Leak sensor |
| Model numbers | YS7903 |
| Status | Current[^1] |
| Type | Puck leak sensor[^1] |
| Power | 2 AAA batteries[^1] |
| Location | Indoor only[^1] |
| Key spec | IP68 housing; probes on top and bottom[^1] |
| Radio | LoRa to a YoLink hub[^1] |
| Range | Up to 2,034 ft (620 m) open air[^1] |

## Integration paths

**How the YoLink Water Leak Sensor 1 connects**

| Path | Requires | Local | Features lost |
| --- | --- | --- | --- |
| [Proprietary + hub](https://smarthomecanon.com/protocols/proprietary-gateway) | YoLink Hub[^1] | unknown | unknown |

**Platform support for the YoLink Water Leak Sensor 1**

| Path | Platform | Support | Integration |
| --- | --- | --- | --- |
| Proprietary + hub | [Amazon Alexa](https://smarthomecanon.com/platforms/alexa) | Native[^1] |  |
| Proprietary + hub | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | withheld | yolink |
| Proprietary + hub | [Homey](https://smarthomecanon.com/platforms/homey) | withheld | com.yolink |

## Related pages

- [YoLink water leak and level sensors](https://smarthomecanon.com/lines/yolink-water-leak-sensors) (line)
- [YoLink](https://smarthomecanon.com/brands/yolink) (brand)
- [Proprietary radio with a hub](https://smarthomecanon.com/protocols/proprietary-gateway) (protocol)
- [Amazon Alexa](https://smarthomecanon.com/platforms/alexa) (platform)
- [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) (platform)
- [Homey](https://smarthomecanon.com/platforms/homey) (platform)

## Sources

[^1]: YoLink Water Leak Sensor 1 - YoLink. https://shop.yosmart.com/products/ys7903 (manufacturer, checked 2026-10-20)