# Using OTG cable for physical connection

By connecting the Android Phone and OTG cable, you can synchronize with the Biometric Wallet via OTG cable instead of Bluetooth.

{% hint style="info" %}
If you are using the OTG cable to connect, it is recommended to disable the Bluetooth function on your Android Phone.
{% endhint %}

## What is an OTG cable? <a href="#otg" id="otg"></a>

OTG stands for **"On-The-Go"** and refers to cable or adapter device that allow USB devices to connect to Android phones. Typically, one side connects to the mobile phone's charging port, while the other side is a standard USB port (USB Type A). Just connect the OTG cable to your Android phone.

<div align="left"><img src="/files/-M5eba1BNDa2nsauuDhg" alt="Example of OTG cable"></div>

{% hint style="info" %}
OTG cables are not included in the D'CENT Biometric Wallet package and must be purchased separately.
{% endhint %}

### Types of OTG devices <a href="#id-5-otg" id="id-5-otg"></a>

There are various types of OTG cables, such as Adapter type and Cable type, and there is a C to C cable type device that can be directly connected to the mobile phone and Biometric Wallet charging port without Adapter or Cable.

Please use an OTG cable that is compatible with your Android phone or Biometric Wallet charging port.

<div align="left"><img src="/files/XMiIXBvxtfi8o5Ow4o5W" alt="Example of OTG devices : Adapter type / Cable type / D&#x27;CENT 2-IN-1 OTG Cable / C to C cable"></div>

## Using Biometric Wallet by connecting with an OTG cable <a href="#otg-1" id="otg-1"></a>

### Launch the D'CENT mobile app

Please launch the D'CENT mobile app first. (Biometric Wallet mode)\
\
Below is a picture showing that there is no connection to with the Biometric Wallet.

<div align="left"><figure><img src="/files/LF4yVk3Nuq2PLtL6G0Ls" alt="" width="563"><figcaption></figcaption></figure></div>

### Connect Android device and Biometric Wallet with OTG cable <a href="#otg-2" id="otg-2"></a>

Depending on the OTG cable you own, connect the Biometric Wallet and the Android device as shown in the picture below.

<div align="left"><img src="/files/l4tRDWlJWhVycYX9roy2" alt=""></div>

### Allow USB access <a href="#usb" id="usb"></a>

**1)** When an OTG cable is connected, you will see the following pop-up. Press **"OK".**

<div align="left"><figure><img src="/files/g0UBDaLY0eFUemgD4P9P" alt="" width="386"><figcaption></figcaption></figure></div>

**2)** When connection is made, Synchronization will begin with the Biometric Wallet and you can start using it when it finishes.

<div align="left"><figure><img src="/files/6C1v5abLTj1ux7p8XTqy" alt=""><figcaption></figcaption></figure></div>

### Firmware Update

You can update the firmware of Biometric Wallet from the mobile phone using an OTG cable.

Please refer to the user guide below for instructions on how to update the firmware using an OTG device.

{% embed url="<https://userguide.dcentwallet.com/biometric-wallet/firmware-update-from-mobile>" %}

{% hint style="info" %}
In order to update the firmware, your **OTG cable must capable of data transfer.**
{% endhint %}


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