# How to send Downlinks to the Kuando Busylight device
{% hint style="success" %}
**Applications**:
The [Kuando Busylight](https://busylight.com/) can be installed in a large variety of use cases. Through a downlink it can be programmed to show any color and used as a **visual notifier**, indicating a certain event, status, or as a cue for specific handling.
**Product features**:
* Meeting room occupancy
* Office desk availability
* Parking lot availability
* Cue for calendar event
* Indicator for status in test or production line
* Indicator for bin availability in the warehouse
* Temperature/humidity/CO2/ indicator
{% endhint %}
In this tutorial, you will learn how to set downlinks to the **Kuando Busylight** to show **color status** as a visual notifier.
### 1. Create a rule
To be able to send downlinks based on a condition, you need to create a **Rule**. Go to *Rules* and select *Create Rule*. Select desired device/s as a **Rule Input**, add a **Logic block** with your defined condition and select **Downlink** as a **Rule Output**.
On the **Downlink Input Field,** you need to select your Kuando Busylight by choosing the assigned **Data Flow** and **Device**. Enter Port *15* and select **JSON** as a **payload schema**.
**Custom payload description** as follows:
```
{
"red":12, // Red intensity max 255 min 0
"green":20, // Green intensity max 255 min 0
"blue":34, // Blue intensity max 255 min 0
"offDuration":10, // Off duration max 255 min 0
"onDuration":10 // On duration max 255 min 0
}
```
If the light shall be **On** all the time, you can set the **onDuration** **to** **255** and **offDuration** **to** **0.**
Test your Rule accordingly to see the changing light colors based on your rule condition.
{% hint style="info" %}
If you do not have a device at your hand, you can use the [Device Simulator](/akenza.io/get-started/create-new-device/device-simulator.md) provided from akenza to trigger your **Downlink**.
{% endhint %}
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