---
title: "SONOFF SNZB-04 control via MQTT"
description: "Integrate your SONOFF SNZB-04 via Zigbee2MQTT with whatever smart home infrastructure you are using without the vendor's bridge or gateway."
addedAt: 2020-07-10T21:02:48Z
pageClass: device-page
---

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# SONOFF SNZB-04

|     |     |
|-----|-----|
| Model | SNZB-04  |
| Vendor  | [SONOFF](/supported-devices/#v=SONOFF)  |
| Description | Contact sensor |
| Exposes | battery, voltage, contact, battery_low |
| Picture | ![SONOFF SNZB-04](https://www.zigbee2mqtt.io/images/devices/SNZB-04.png) |
| White-label | eWeLink RHK06 |


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## Notes


### Pairing
Long press reset button for 5s until the LED indicator flashes three times, which means the device has entered pairing mode
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## Exposes

### Battery (numeric)
Remaining battery in %.
Value can be found in the published state on the `battery` property.
To read (`/get`) the value publish a message to topic `zigbee2mqtt/FRIENDLY_NAME/get` with payload `{"battery": ""}`.
It's not possible to write (`/set`) this value.
The minimal value is `0` and the maximum value is `100`.
The unit of this value is `%`.

### Voltage (numeric)
Reported battery voltage in millivolts.
Value can be found in the published state on the `voltage` property.
To read (`/get`) the value publish a message to topic `zigbee2mqtt/FRIENDLY_NAME/get` with payload `{"voltage": ""}`.
It's not possible to write (`/set`) this value.
The unit of this value is `mV`.

### Contact (binary)
Indicates whether the device is opened or closed.
Value can be found in the published state on the `contact` property.
It's not possible to read (`/get`) or write (`/set`) this value.
If value equals `false` contact is ON, if `true` OFF.

### Battery low (binary)
Indicates whether the battery of the device is almost empty.
Value can be found in the published state on the `battery_low` property.
It's not possible to read (`/get`) or write (`/set`) this value.
If value equals `true` battery low is ON, if `false` OFF.