# Button in API 6

The button is the simplest sensor we have on our devices. The device recognizes various types of clicks **based on time** and this is how you control your SimplePack (and your SimpleIndustry).

{% hint style="info" %}
The functionality of the button is rewired to the **reed switch in the SimpleIndustry**, the reed switch behaves like the button in this device, so this article is important for SimpleIndustry users too!
{% endhint %}

### Overview <a href="#overview" id="overview"></a>

**Button functionality**:

1. The button is how you **request downlink (change settings) and arm/disarm devices (activate/deactivate user modes)**.

   [More in the **Basic operations guide** HERE!](https://simplehw.atlassian.net/wiki/spaces/DOC/pages/8519899/API+6+Basic+Operations+With+SimpleHw+Devices)
2. There are two button-based **User modes: Press me (+ WiFi variants) and Blinker**. You can find an overview of both of these modes below.
3. You can also receive **independent alerts** from the button in other modes.

   [More about **independent alerts** HERE!](https://simplehw.atlassian.net/wiki/spaces/DOC/pages/15237121/API+6+Mode-Independent+Information+And+Events#Sensor-triggered-mode-independent-events)
4. The button can also be used to **switch the RC zone** of your device.

   [**Manual zone switch**](https://ask.simplehw.eu/api-6/rc-switch/)

### User modes <a href="#user-modes" id="user-modes"></a>

#### Press me (+ WiFi variants) <a href="#press-me-wifi-variants" id="press-me-wifi-variants"></a>

Simple mode that sends different alerts based on the length of button click - short press, double click, long press, extra long press.

#### Blinker <a href="#blinker" id="blinker"></a>

When the button is clicked, the device sends an alert and the LED will start blinking. When the button is pressed again, a different alert is sent and the blinking stops.

### Relevant registers <a href="#relevant-registers" id="relevant-registers"></a>

| Register hex | Register name          | Value range              | What it is and what it does                                  | Useful for                           |
| ------------ | ---------------------- | ------------------------ | ------------------------------------------------------------ | ------------------------------------ |
| 0x0E         | Device control presets | 8 binary flags           | Bits 3, 4 and 5 control the button. More in the table.       | All modes                            |
| 0x56         | Device control presets | 8 binary flags           | Bit 7 controls LED patterns of short press.                  | Press me + independent button alerts |
| 0x57         | Device control presets | 8 binary flags           | Bits 7 and 6 control disarming by button.                    | All modes                            |
| 0x59         | Button press timing    | 2 sets of 4 binary flags | Customizes the time between various types of button presses. | Press me + independent button alerts |