# Set up Device Thresholds and Enable Trigger Notifications
## Define a Threshold
In the "[**Real-time monitoring**](https://deviceon.gitbook.io/docs/web-user-interface/device-management/real-time-monitoring-and-rule-engine#real-time-monitoring)" page, you can click the icon  in the upper right corner of the sensor widget of interest to configure the **Rule Engine**.
#### IF Sections
* **Range**: You have the option to define the range, specifying values more than, less than, or both.
* **Lasting Time**: Indicates that the target device enters an abnormal condition only when it reaches the set threshold and remains in that condition for the set duration.
* **Notice Interval**: Specifies the frequency at which users receive an event notification until the condition returns to normal.
* **Custom Threshold Message**: Define a customized event log message of warning.
#### THEN Sections
* **Actions & Execution**: **When the set threshold is exceeded, you can choose the actions to be taken, such as** Power On/Off or **hardware control**, like GPIO control.
* **Trigger Frequency**: Set the trigger to "**Once**", "**Back to Normal**" or "**Always**."
* **Custom Action Messag**e: Define a customized event log message of action.
After configuring the Rule Engine, the Sensor Widget will have an additional **yellow pointer**. Hovering over it will provide information about the set threshold value.
Additionally, within the **System Rule's Widget**, you can also check how many rule statuses are currently available.
* Rule Item: The number of rules that were created.
* Monitoring: The number of active rules.
* Out of Range: The number of rules that are out of range.
It provides a convenient way to manage and control the rules you have set up, making it efficient to make changes or **batch apply**  **the same rule to multiple devices simultaneously**.
## Enable Notification
Select a notification item for the **Threshold Category** and ensure your account's alert service is enabled
### Notification Item
### Personal Alert Services
Please go to your personal [**account settings**](https://deviceon.gitbook.io/docs/web-user-interface/account-management#notification) to enable or disable alert notifications for email, text messages, and social media."
{% hint style="danger" %}
***These alert services are personal setting***. Please make sure the related services “[**Setting -> Notification**](https://deviceon.gitbook.io/docs/web-user-interface/system-setting#notification)” is configured, enabled on DeviceOn System.
{% endhint %}
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