Card reader Retoo E378 with USB and USB-C ports supporting microSD and SDHC cards

Retoo E378 is a compact multi-format card reader that supports microSD and SDHC cards and connects to host devices via both standard USB-A and USB-C ports. Designed for straightforward file access, it enables transfers of photos, videos and documents between removable storage and computers, laptops or compatible mobile devices without the need for additional drivers on most modern operating systems.

Advantages

The Retoo E378 offers dual-interface connectivity with USB-A and USB-C, allowing use with a wide range of devices. Its support for microSD and SDHC cards covers the most common consumer memory formats used in cameras, action cams and smartphones. The reader’s plug-and-play operation reduces setup time, and its small form factor makes it easy to carry in a camera bag or laptop case.

Suitable for

• Photographers transferring photos and RAW files from microSD/SDHC cards
• Content creators moving video clips from action cams and drones
• Office and home users backing up or accessing documents from removable cards
• Mobile users with USB-C smartphones or tablets that support external storage

When it may not be suitable

This card reader is intended for microSD and SDHC cards; it does not support newer higher-capacity card standards beyond SDHC such as SDXC if those cards require exFAT formatting or UHS-II specific speeds. It also does not provide built-in wireless transfer capabilities or on-device storage—an intermediary host device is required for file access and transfers.

Key specifications

• Supported card formats: microSD, SDHC
• Interfaces: USB-A and USB-C connector options for host connection
• Compatibility: Plug-and-play on most Windows, macOS and Android devices that support external storage
• Physical design: compact, portable form factor

How to use

Insert a compatible microSD or SDHC card into the reader’s card slot, then connect the reader to a computer, laptop or compatible mobile device using the appropriate USB-A or USB-C connector. Once connected, the host device should recognise the card as external storage, allowing file browsing, copying and deletion using the host’s file manager. Safely eject or unmount the card from the operating system before physically removing the reader to avoid data loss.

What to consider before purchase

• Ensure your memory card is microSD or SDHC; SDXC cards or other formats may not be fully supported.
• Check whether your device requires USB-C or USB-A and whether an adapter is needed.
• Confirm your operating system supports external card readers without additional drivers.

Usage recommendations

For reliable transfers, use high-quality microSD/SDHC cards and avoid removing the card while data is being written. If using a mobile device, verify OTG or external storage support in device settings before relying on the reader for field work.