> 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/m400/m400-installation-guide/maintenance-and-cleaning.md).

# Maintenance and Cleaning

## General Care

Your device exemplifies superior design and craftsmanship. The following recommendations are provided to help safeguard your warranty coverage:

* Avoid storing the device in hot areas, as elevated temperatures can diminish the lifespan of electronic components, harm batteries, and cause deformation or melting of certain plastics.
* Refrain from storing the device in cold areas, as the return to normal temperatures may lead to moisture formation inside the device, potentially damaging electronic circuit boards.
* Exercise caution to prevent dropping, knocking, or shaking the device, as rough handling can result in the breakage of internal circuit boards and delicate mechanics.

These recommendations are equally applicable to both your device and any accompanying attachments or accessories. If your device is experiencing operational issues, kindly visit the nearest Verifone authorized service provider for maintenance or replacement.

## Cleaning & Sanitizing Guidelines

Verifone devices should only be gently cleaned to remove dirt, residue, or debris using a lightly water-damped, clean microfiber cloth. One or two drops of pH-neutral, non-scrubbing soap may be used. Do not use solvents, harsh detergents, or abrasive cleaners.

Using improper cleaning methods or products may result in functional and/or cosmetic issues that are not covered under warranty.

**Important Guidelines:**

{% stepper %}
{% step %}
**Avoid Direct Application**

Never spray, coat, or pour any liquid, sanitizer, or disinfectant directly onto the device.
{% endstep %}

{% step %}
**Caution Against Harsh Chemicals**

Avoid using bleach, hydrogen peroxide, thinner, trichloroethylene, or ketone-based solvents, as they can degrade plastic and rubber components.
{% endstep %}

{% step %}
**Electrostatic Discharge (ESD) Prevention**

Exercise caution to prevent ESD by refraining from vigorously rubbing with a dry towel or similar actions, as they can cause ESD and trigger a tamper alert.
{% endstep %}
{% endstepper %}

<figure><img src="/files/aERwtPZOFlFHZtP9AK2g" alt=""><figcaption></figcaption></figure>

## Cleaning Instructions

1. Turn off your device.
2. Disconnect it from the power source.
3. Clean it following the instructions and guidelines mentioned above. Once completely dry, reconnect to power up.


---

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