> For the complete documentation index, see [llms.txt](https://docs.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.verifone.com/hardware-products/hardware/engage-devices/ux1-3-4xx-series/ux4xx/ux401-installation-guide/device-overview.md).

# Device Overview

The UX401 device is a contactless payment device that works with the UX301 host device. The reader supports transactions in a variety of environments, specifically outdoor and unattended markets.

## Features and Benefits

The UX401 is Verifone's contactless acceptance peripheral device, designed to connect with the UX301 unit. It creates an economical solution for merchants who are looking to expand their payment acceptance options. The contactless card reader allows a customer to quickly pay for items using their contactless card and tapping it near, or on the device, thus completing their transaction with speed and ease, without further input.

### Exceptional Ease of Use

The following features of the device simplify transactions in various environments:

* Integrated proximity sensors for system wake-up from low power mode with card presence.
* CTLS logo placement on device for optimized user experience.
* Bright LEDs to display card transaction progress.

{% hint style="info" %}
The implementation of the LED color configuration varies by (or may not be present in some) regional locations.
{% endhint %}

* Buzzer for audio confirmation of contactless transactions.
* Compact, sleek, and stylish shape.
* Quick and easy to use.
* Rugged and reliable design.
* Conducive design supports payment transactions in a variety of payment situations, such as transportation, vending, and kiosk environments.

### Compliance

The following EMVCo features of the device ensure secure contactless transactions:

* EMV CTLS Level 1 and Level 2 Type Approval

### Contactless Capabilities

The device includes the following contactless capabilities:

* Verifone's advanced contactless architecture future-proofs your investment with Single Contactless Interface (SingleCI), and side-by-side application architecture systems.
* Supports contactless cards as well as NFC phones, supporting the following protocols:
  * ISO 14443 A\&B
  * MiFare (MiFare + / DESfire)
  * ISO 18092 Active Communications (NFC - peer-to-peer mode)
  * FeliCa
  * PayPass
  * payWave


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.verifone.com/hardware-products/hardware/engage-devices/ux1-3-4xx-series/ux4xx/ux401-installation-guide/device-overview.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.