> 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/ux3xx/ux300-installation-guide/maintenance-and-cleaning.md).

# Maintenance and Cleaning

Your card reader should be treated with care. It has no user-serviceable parts.

The following suggestions will help you protect your warranty coverage.

* Do not store the device in hot areas. High temperatures can shorten the life of electronic devices, damage batteries and warp or melt certain plastics.
* Do not store the device in cold areas. When the device returns to its normal temperature, moisture can form inside the device and damage electronic circuit boards.
* Do not drop, knock, or shake the device. Rough handling can break internal circuit boards and fine mechanics.
* Do not use harsh chemicals, cleaning solvents or strong detergents to clean the device.

The following table lists the chemicals that you can use for cleaning. Chemicals that are not safe to use are also listed. Never use these chemicals as they can deteriorate plastic or rubber parts.

|                 | Chemicals                                                               |
| --------------- | ----------------------------------------------------------------------- |
| Recommended     | n-hexane, gasoline, ethyl-alcohol                                       |
| Not Recommended | acetone, butanone, thinner, trichloroethylene, or ketone-based solvents |

{% hint style="warning" %}
Never use thinner, trichloroethylene, or ketone-based solvents – they can deteriorate plastic or rubber parts.
{% endhint %}

These suggestions apply equally to your device, or any of its attachments or accessories. If your device is not working properly, take it to the nearest Verifone-authorized service provider for servicing or replacement.

## Additional Safety Information

The following is additional information for your safety in using this device.

### Potentially Explosive Environments

When using the device in areas with potential risk of explosion, such as petrol stations, follow the advice of all signs and instructions. If there has been a leak, do not use this device.


---

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