Versatile Connectivity and Simultaneous Card Use
This 2-way memory card reader can connect to USB-A ports on PCs and USB Type-C ports on smartphones and tablets. It features two slots, one for SD cards and one for microSD cards, both of which can be used simultaneously. This allows for direct data movement and copying between the two media types or to and from a connected device. This functionality is particularly useful for importing data from digital cameras and action cameras to smartphones or PCs for editing and social media uploads.

No dedicated drivers are required; users can simply plug the device into a USB port to start using it. It is important to note that the SD card lock function and copyright protection functions are not supported.

High-Speed and Reliable Data Transfer
The reader supports UHS-I (up to 104MB/s, theoretical value) for both SD and microSD card slots, facilitating smooth and rapid transfer of large volumes of data, such as photos and videos. The design aims to minimize compatibility issues between connected devices, ensuring stable data quality based on authentication tests for send/receive signals. It is also compatible with UHS-II and SD Express cards, though data transfer speeds for reading and writing will be at UHS-I speeds.

Premium Design and Portability
The memory card reader features a high-grade aluminum casing, which offers excellent heat dissipation and noise resistance. An access lamp indicates media access status. The slim stick-type design, approximately 9mm thick, allows for easy storage in bags or pouches. It comes with a cap to protect the connectors when not in use and a strap hole for attaching an included strap or a personal one, helping to prevent loss.



“THINK ECOLOGY” Certified Product
This product is certified under Elecom’s “THINK ECOLOGY” environmental standard, meeting at least one of the company’s environmental criteria. It uses an outer box designed for improved transport efficiency to reduce environmental impact. The packaging consists solely of paper, cardboard, and plastic bags, and the plastic weight in the packaging has been reduced by over 20% compared to internal company standards.

For more information on Elecom’s environmental initiatives, please visit: https://www.elecom.co.jp/sustainability/think-ecology/
Main Specifications
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Upstream Connector: USB Type-C plug , USB-A plug
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Supported SD Cards: SD(DS/HS), SDHC(DS/HS/UHS-I/UHS-II※1/SD Express※1), SDXC(DS/HS/UHS-I/UHS-II※1/SD Express※1)
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Supported microSD Cards: microSD(DS/HS), microSDHC(DS/HS/UHS-I/UHS-II※1/SD Express※1), microSDXC(DS/HS/UHS-I/UHS-II※1/SD Express※1)
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Number of Slots: 2
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Supported OS (※2): Windows 11/10, macOS Sequoia 26, iOS 26, iPadOS 26, Android(TM) 16/15/14
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Maximum Transfer Speed: 104MB/s (theoretical value)
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External Dimensions/Weight: Approx. 17mm (W) × 69mm (D) × 9mm (H) (including cap) / Approx. 13g
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Accessories: Cap, Strap
※1: Data transfer speeds for reading and writing will be at UHS-I speeds.
※2: Updating to the latest version of each OS or installing service packs may be required.
Product Information
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Model Number: MR3C-D21BK
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Price: ¥2,481 (Estimated retail price) ¥2,255 (Excluding tax)
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Product URL: https://www.elecom.co.jp/products/MR3C-D21BK.html
Where to Purchase
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BicCamera.com: https://www.biccamera.com/bc/item/15277300/
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Elecom Direct Shop (Rakuten): https://item.rakuten.co.jp/elecom/4549550443128/
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Elecom Direct Shop (Yahoo! Shopping): https://store.shopping.yahoo.co.jp/elecom/4549550443128.html
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Elecom Direct Shop (Main Store): https://shop.elecom.co.jp/item/4549550443128.html

