> 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/m4xx-series/m425/m425-installation-guide.md).

# M425 Installation Guide

This guide is the primary source of information for setting up the M425 device.

## Audience

This guide is intended for the users involved in M425 device installation.

## Organization

This guide is organized as follows:

* [Device Overview](/hardware-products/hardware/engage-devices/m4xx-series/m425/m425-installation-guide/device-overview.md) - Provides an overview of the M425 device.
* [Setup](/hardware-products/hardware/engage-devices/m4xx-series/m425/m425-installation-guide/device-setup.md) - Provides instructions on configuring the M425 device.
* [Specifications](/hardware-products/hardware/engage-devices/m4xx-series/m425/m425-installation-guide/specifications.md) - Provides the power requirements and dimensions of the M425 device.
* [Maintenance and Cleaning](/hardware-products/hardware/engage-devices/m4xx-series/m425/m425-installation-guide/maintenance-and-cleaning.md) - Explains how to maintain the device.
* [Service and Support](/hardware-products/hardware/engage-devices/m4xx-series/m425/m425-installation-guide/service-and-support.md) - Furnishes information on contacting local Verifone representatives or service providers, as well as details on ordering accessories or documentation from Verifone.
* [Troubleshooting Guidelines](/hardware-products/hardware/engage-devices/m4xx-series/m425/m425-installation-guide/troubleshooting-guidelines.md) - Provides guidance for addressing issues that may arise during device installation.

## Related Documentation

To learn more about the M425, refer to the following documents associated with the Verifone Part Number (VPNs).

| Document                                                                                        | Verifone Part Number |
| ----------------------------------------------------------------------------------------------- | -------------------- |
| M425 Certifications and Regulations                                                             | VPN DOC391-001-EN    |
| [M425 Quick Installation Guide](/hardware-products/hardware/engage-devices/m4xx-series/m425.md) | VPN DOC391-002-ENG-B |

## Conventions

The following table describe the Conventions and provides examples of their use.

| Convention  | Meaning                                                                             | Example                                                                   |
| ----------- | ----------------------------------------------------------------------------------- | ------------------------------------------------------------------------- |
| **NOTE**    | The pencil icon is used to highlight important information.                         | RS232-type devices do not work on the M425 communication port.            |
| **CAUTION** | The caution symbol indicates possible hardware or software failure or loss of data. | The unit is intended for indoor use only. Do not use the device outdoors. |
| **WARNING** | The lightning symbol is used as a warning when bodily injury might occur.           | Do not use the device near water due to risk of shock.                    |

***VPN:DOC391-003-ENG-A, Rev A03***


---

# 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/m4xx-series/m425/m425-installation-guide.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.