> For the complete documentation index, see [llms.txt](https://linemasters-organization.gitbook.io/linemaster-2.4ghz-zephyr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://linemasters-organization.gitbook.io/linemaster-2.4ghz-zephyr/programing/timer.md).

# Timer

The handle includes a built-in timer function that allows you to set flight durations *without needing an external stopwatch*. You can configure a time between **30 seconds and 15 minutes**.

This feature includes two screens:

* One for **timer setup**
* Another for **execution**, where the remaining time is shown as a countdown

When there’s **1 minute remaining** and again at **zero**, the device triggers **sound and haptic alerts (vibration)** to notify you that the programmed time has ended.

{% hint style="info" %}
This timer does not control the throttle or interfere with any flight function. It is purely informational. In future firmware updates, an **advanced timer** will be introduced, allowing for remote motor control—including options like RPM configuration, throttle curves, engine cutoff, and flight start/stop directly from the handle.\
This feature will replicate the behavior of timers used in electric Control Line models.
{% endhint %}

{% hint style="info" %}
This timer does not provide the accuracy required for highly demanding applications. For more precise measurements, use a professional-grade device.
{% endhint %}

{% embed url="<https://www.youtube.com/watch?v=ZwlxPExxhCo>" %}

### Timer Setup

Navigate to the **Duration** option using `↑` and `↓`. Once highlighted, press the **cursor click** to select it.

Use `↑` and `↓` again to increase or decrease the time in 30-second increments.\
Press the cursor click to confirm the selected duration.

Once the time is set, navigate to the **Start** option and click to enter the timer execution screen.

### Running the Timer

When the execution screen opens, the countdown hasn’t started yet. You’ll see a button labeled **“Start”**. Prepare your model and verify everything is ready.\
When you’re good to go, press the **cursor click** to begin the countdown.

Once started, the button will switch to **“Pause”**. You can click at any time to pause the timer. When paused, the button changes to **“Resume”**, allowing you to continue the countdown when you’re ready.\
You can pause and resume the timer as many times as needed.

* When **1 minute remains**, a **sound and vibration alert** will notify you.
* When the countdown reaches zero, you’ll hear **three beeps with vibration**, signaling the end of the flight time.

The display will show **00:00** along with a button to return to the timer setup screen.\
Click the cursor to go back.

{% hint style="info" %}
To exit the execution screen before the countdown ends, press and hold the cursor click for a few seconds. This will cancel the countdown and return you to the setup screen.
{% endhint %}