---
title: Morse Code Couples Cards Quick Start Guide
description: "## 0. Read This First — Battery Installation If your device won’t power on, the battery may be installed incorrectly. Please make sure: - The **CR1632 battery negative (-) side faces down**. - Insert the battery at an angle into…"
url: "https://plugplaykit.com/es/docs/morse-code-couples-cards-quick-start-guide/"
updated: "2026-06-09"
category: Technical Support
---

# Morse Code Couples Cards Quick Start Guide

## 0. Read This First — Battery Installation

If your device won’t power on, the battery may be installed incorrectly.

Please make sure:

- The **CR1632 battery negative (-) side faces down**.
- Insert the battery at an angle into the holder.
- **Avoid touching the positive contact tab** on the side of the battery holder.
- Refer to the rear-side photo shown above for the correct installation method.

If you're still unsure how to install the battery, you can watch my video tutorial on Douyin (TikTok China):

**Douyin ID:** 621163699

---

## 1. Unboxing Checklist

Make sure you have at least:

- One **morse TWO** device
- A **CR1632 battery**, or a unit with the battery already installed
- A **USB cable** for firmware updates and debugging (if your version includes a USB port)

---

## 2. First Power-On

1. Turn on the power switch.
2. Wait for the LED startup animation to finish.
3. After startup, the device automatically enters **Local Practice Mode**.

By default, **morse TWO does not enable wireless communication and will not automatically connect to a phone.**

---

## 3. Send Your First Letter

### Try sending **E**

1. Press the button briefly once.
2. Release the button and wait for decoding.
3. The LED should display **E**.

### Try sending **T**

1. Press and hold the button once.
2. Release the button and wait for decoding.
3. The LED should display **T**.

---

## 4. Adjusting Speed

Within **5 seconds after powering on**, enter one of the following commands:

| Command | Speed |
| --- | --- |
| TT | Turtle (Slowest) |
| LL | Low |
| MM | Medium |
| HH | High (Default) |
| UU | Ultra (Fastest) |

For beginners, **TT** or **LL** is recommended.

---

## 5. Mute Mode

To disable the buzzer:

1. Power the device off and back on.
2. Within 5 seconds after startup, enter:BB

1. The **B** indicator will light up, confirming that mute mode has been toggled.

Enter **BB** again to restore sound.

---

## 6. Communicating Between Two Devices

If you have two morse TWO units:

1. Power-cycle both devices.
2. Within 5 seconds after startup, enter:DD

on both units.

1. Send a letter from either device.
2. The other device should display and play back the received letter.

To return to Local Practice Mode, simply power-cycle the devices again.

---

## 7. Phone Configuration

To modify settings from a smartphone:

1. Power-cycle the device.
2. Within 5 seconds after startup, enter:WW

1. Open **nRF Connect**.
2. Search for:

**Morse Config 1.00**

1. Connect and open the **FFE0** service.

Common parameters:

| Characteristic | Function | Value |
| --- | --- | --- |
| FFE1 | Mute | 00 = Off, 01 = On |
| FFE2 | Speed Level | 00–04 |
| FFE3 | Letter Gap | 03 or 06 |
| FFE4 | Factory Reset | A5 |

---

## 8. OTA Firmware Update

To update firmware:

1. Power-cycle the device.
2. Within 5 seconds after startup, enter:**OO**

1. When the **O** indicator starts blinking, the device enters **IAP mode**.
2. During IAP mode, the **O** indicator continues blinking.
3. Open the **WCH OTA Tool**.
4. Select the application firmware:

**obj/morse_two.hex**

1. Start the update.

---

## 9. Power Saving

In Local Practice Mode, **morse TWO automatically enters low-power mode after the display operation is complete.**

Press the button again to wake the device.

For extended storage or long periods of inactivity, it is still recommended to turn off the hardware power switch.