UGREEN 4-in-1 Card Reader with USB-C & USB-A 2-in-1 interface – CM812

UGREEN 4-in-1 Card Reader with USB-C & USB-A 2-in-1 interface – CM812

You shoot a full day on location. Back at the laptop, you have an SD card from the camera, a TF card from the drone, a flash drive with client-supplied assets, and a USB mouse. Most card readers handle one or two of those. The UGREEN CM812 card reader USB-C USB-A handles all four at once — and it works equally on a MacBook-C port or a desktop’s USB-A port without swapping accessories.

One Device, Every Card and Port You Need

The CM812 is a 4-in-1 hub that combines an SD slot, a TF (Micro SD) slot, and two USB-A ports into a single compact reader. Its dual-interface connector — USB-C on one side, USB-A on the other — plugs directly into whichever port your device has. No adapter required either way.

All four ports operate simultaneously. Transfer footage from both cards while a flash drive and a peripheral sit connected. Nothing waits.

5Gbps Transfer Speed at 170MB/s

The CM812 runs on USB 3.0, delivering transfer speeds up to 5Gbps — rated at 170MB/s in real-world throughput. A 4GB RAW file moves in seconds. A folder of 4K video clips clears in under a minute. The card and the host device determine the ceiling; the reader does not create a bottleneck.

Broad Card Compatibility — Up to 2TB

The SD slot reads SDXC, SDHC, SD, MMC, and RS-MMC cards. The TF slot reads Micro SDXC, Micro SDHC, and Micro SD cards. Both slots support cards up to 2TB capacity — well beyond the range of current consumer cards, meaning the CM812 will not become obsolete as card capacities grow.

Built-In Fuse and LED Status Indicator

A built-in fuse protects connected devices against power surges. The LED indicator lights up during active data transfer, confirming the connection is live. Both are practical details that cheaper readers omit. For the full range of USB accessories and card readers at Big Mind Technologies, the CM812 sits at the capable end of the portable reader category.

Verified Specifications

The data below confirms all performance claims for the UGREEN CM812.

Performance and Connectivity

• Model: CM812 (Part No: 45167)
• Interface: USB-C + USB-A 2-in-1 connector (USB 3.0)
• Transfer Speed: Up to 5Gbps / 170MB/s
• Card Slots: 1x SD, 1x TF (Micro SD)
• USB Ports: 2x USB-A
• Simultaneous Operation: All four ports active concurrently
• Card Support: SDXC, SDHC, SD, MMC, RS-MMC, Micro SDXC, Micro SDHC, Micro SD
• Maximum Card Capacity: Up to 2TB
• OTG Support: Yes — compatible with OTG-enabled smartphones and tablets

Build and Compatibility

• Shell: ABS + PVC
• Protection: Built-in fuse against power surges
• Indicator: LED transfer status light
• Plug-and-Play: No drivers or software required
• OS Compatibility: Windows, macOS, Linux, Android (OTG-enabled), Chrome OS
• Warranty: 12 months

Where It Earns Its Keep

The Photographer Importing a Full Shoot

Two cards come out of the camera bag — one SD from the body, one TF from a secondary device. Both slot in at once. Files transfer to the editing drive while the card reader sits on the desk, taking up the space of a thumb drive. The 170MB/s throughput moves RAW files fast enough to start culling before the full import finishes.

The Drone Operator Working in the Field

A drone TF card and a camera SD card both need offloading before the next flight window closes. The CM812 handles both simultaneously. Its USB-C connector works directly with a tablet or a USB-C laptop — no dongle in between. On a Windows machine with a USB-A port, flip the connector the other way and plug in directly.

The Student Moving Between Devices

A MacBook at home, a university lab desktop, and an Android tablet in lectures. The CM812 connects to all three via one device. OTG support means the tablet reads the SD card directly — no laptop needed to act as a relay. Assignments, presentations, and lecture recordings transfer wherever the work continues.

The Professional Presenter On the Move

A USB flash drive with the presentation, a TF card with backup assets, and a USB mouse for the slideshow. All three connect to the CM812 at once. It slips into a jacket pocket. The LED confirms it is live the moment it is plugged in. Full compatibility details for all supported devices are available on the official UGREEN CM812 product page.

The Big Mind Technologies Guarantee

Big Mind Technologies stocks genuine UGREEN products backed by a 12-month manufacturer warranty. The CM812 ships ready to use — no setup, no drivers, no configuration. Contact our team before you order if you need to confirm compatibility with your specific device or operating system.