# Seting Up the D135 for the Finix Checkout iOS App

The [Pax D135](/guides/in-person-payments/select-your-device/pax-d135) is a card reader that works with the Finix Checkout iOS app to accept in-person payments. Buyers can pay by tapping, swiping, or dipping their card using the device's:

- Contactless card reader
- Magnetic stripe reader
- IC/smart card (chip) reader


To order a D135, contact your Finix point of contact.

For an in-depth overview of the D135's features and hardware, refer to the [Pax D135 Quick Setup Guide](https://www.pax.us/support/documents/d135-quick-setup-guide/).

## Prerequisites

Before pairing the D135 with your iPhone:

- **Charge the device**: Connect the charging cable to the D135. The charging indicator flashes slowly while charging. When you unplug the cable and the indicator is solid green, the device is fully charged.
- **Turn on the device**: Press and hold the button on the side of the D135 until it beeps and powers on.
- **Enable Bluetooth on your iOS device**: The Finix Checkout iOS app connects to the D135 over Bluetooth. USB is not supported.


## Add the D135

1. Open the **Finix Checkout** app and tap **...** (More) in the navigation bar.


Finix Checkout iOS app More screen showing Manage Devices, Payment Links, App Info, and Logout options
1. Tap **Manage Devices**.


Finix Checkout iOS app Manage Devices screen
1. Tap the **+** icon in the top-right corner.
  - The **Add a Device** screen displays.


Finix Checkout iOS app Add a Device screen with setup instructions
1. Follow the on-screen instructions to make sure the device is on, then tap **Next**.
  - A **Searching for Nearby Devices** screen displays listing nearby Bluetooth devices.


Finix Checkout iOS app Searching for Nearby Devices screen listing available Bluetooth devices
1. Tap the device that matches the serial number (S/N) shown on your D135 or its packaging.
2. On the **Add a Device** screen, optionally update the device name and add a description, then tap **Add Device**.
  - A **Registering Device** message appears, followed by an **Activating Device** message.


Finix Checkout iOS app Add a Device form with name and description fields
Finix Checkout iOS app showing Activating Device message
1. When prompted with a Bluetooth pairing request on your iPhone, tap **Pair**.
  - A **Connecting to Device** message displays, followed by a **Setting up your device** screen.
  - You only need to complete this setup once.


Finix Checkout iOS app Setting Up Your Device screen showing firmware update progress
Finix Checkout iOS app Setting Up Your Device screen showing parameters update progress
1. When the device beeps, setup is complete and you are returned to the **Manage Devices** screen.


Finix Checkout iOS app Manage Devices screen after successfully adding a device
## Connect the D135

After adding the D135, you need to connect it before taking payments.

1. From the **Manage Devices** screen, tap the device that matches your D135's S/N.
  - The **Device Details** screen displays.


Finix Checkout iOS app Device Details screen showing device information and Connect button
1. Tap **Connect**.
  - A **Setting up your device** screen displays with a progress bar.
2. When complete, you are returned to the **Manage Devices** screen. The device displays a **Connected** status when the connection is successful.


Finix Checkout iOS app Device Details screen showing a connected device
Finix Checkout iOS app Manage Devices list showing device with Connected status
You are now ready to [process payments using the D135](/low-code-no-code/mobile-apps/finix-checkout-ios/taking-a-payment).

## Managing the D135

Tap a device from the **Manage Devices** screen to open its **Device Details** page. From there, you can:

| Action | Description |
|  --- | --- |
| **Connect / Disconnect** | If the device is disconnected, tap **Connect** to reconnect. If the device is connected, tap **Disconnect** to disconnect it. |
| **Edit Details** | Tap **Edit Details** to update the device name or description. |
| **Reset Device** | Tap **Reset Device** to factory reset the D135. After resetting, you will need to [add and connect the device](#add-the-d135) again. |
| **View in Dashboard** | Tap **...** in the top-right corner to open the device's details page in the Finix Dashboard. |


Finix Checkout iOS app Edit Device Details screen
Finix Checkout iOS app Device Details screen showing option to open device in Finix Dashboard
The **Device Details** page also shows the device name, type (PAX D135), serial number, connection status, creation date, and description.

## Next Steps

| Next Step | Description |
|  --- | --- |
| [Take a Payment](/low-code-no-code/mobile-apps/finix-checkout-ios/taking-a-payment) | Process a sale or authorization using the D135. |