SmartQ C307 DUO SD Card Reader Portable USB 3.0 Flash Memory Card Adapter Hub for SD, Micro SD, SDXC, SDHC, MMC, Micro SDXC, Micro SDHC, UHS-I for Mac, Windows, Linux, Chrome, PC, Laptop, Switch (Duo)

Tested this out on the new laptop. Works great. It's a shame most new laptops don't come with a DVD and card slot reader built in. This item was worth the money and transfers the data quick. Glad I bought this.

The SD card adapter was delivered quickly and worked well. Only problem I had was with the product description. The title made it sound like each device had two slots, but the product description was not clear. Hard to tell if one device had two slots, one for an SD and one for a MicroSD card, or if I had to buy two that had one slot each. Managed to find a picture that showed the two slots in the side, so I only needed to buy one.

The SmartQ USB 3.0 Dual Slot SD Card Reader is engineered for users who need consistent, high‑bandwidth transfers across SD and microSD formats. Its compact design hides a surprisingly capable controller that takes full advantage of USB 3.0’s 5Gbps interface, making it a strong choice for photographers, videographers, and data‑heavy workflows. 🔌 Interface & Controller Performance • USB 3.0 (5Gbps) interface ensures significantly higher throughput than USB 2.0 readers. • Backward compatible with USB 2.0 ports, though performance will be limited by the host controller. • The internal controller handles SD and microSD independently, allowing smooth switching between cards without latency spikes. In real‑world testing, the reader consistently saturates the maximum speeds of UHS‑I cards, which is the practical ceiling for most consumer SD media. Card Format & Standard Support The reader supports a wide range of card types: • SD / SDHC / SDXC • microSD / microSDHC / microSDXC • UHS‑I bus speeds • FAT32, exFAT, and NTFS file systems (host‑dependent) While it does not support UHS‑II’s second row of pins, it reads UHS‑II cards at UHS‑I speeds without compatibility issues. Throughput & Transfer Characteristics Typical real‑world performance with quality UHS‑I cards: • Read speeds: 80–95 MB/s • Write speeds: 60–80 MB/s These numbers align closely with the maximum throughput of UHS‑I media and demonstrate that the USB 3.0 interface is not the bottleneck. The reader maintains stable transfer rates during large file copies, such as: • 4K video footage • RAW photo bursts • High‑resolution drone files • Large sequential data blocks Thermal throttling is minimal due to the low‑power controller and efficient heat dissipation through the casing. Dual‑Slot Architecture • Independent SD and microSD slots • Hot‑swappable • No shared bandwidth issues during single‑card use The reader does not support simultaneous dual‑card transfer, but it switches between slots instantly and reliably. Compatibility & Driver Behavior • Native plug‑and‑play on Windows, macOS, Linux, and ChromeOS • No proprietary drivers required • Enumerates as a standard USB mass‑storage device • Stable behavior across sleep/wake cycles and hot‑plugging This makes it ideal for field work, travel, and multi‑device workflows. Build & Electrical Characteristics • Lightweight ABS housing • Low power draw suitable for laptops and tablets • LED activity indicator for transfer monitoring • Tight slot tolerances to protect card contacts Despite its small size, the build quality is solid enough for daily use in a camera bag or tech kit. Final Verdict The SmartQ USB 3.0 Dual Slot SD & Micro SD Card Reader is a technically efficient, high‑throughput solution for anyone working with modern SD media. Its USB 3.0 interface, UHS‑I‑optimized performance, broad compatibility, and stable controller behavior make it a dependable tool for professional and enthusiast workflows alike.

This thing has saved my ass many times, I cannot thank this thing enough. Must have computer product! Although. My only concern with it is that I don't really like how sometimes it can get hot? I mean I'm unsure how or WHY it can get hot, but that's probably because its transferring data.

The SmartQ C307 USB 3.0 Portable is a highly functional and efficient device that stands out in the realm of portable card readers. Here’s an in-depth review: Design and Build Quality The SmartQ C307 boasts a sleek, compact design that makes it extremely portable and easy to carry around. Its sturdy construction ensures durability, so it can withstand regular use and travel. The matte finish not only enhances its aesthetic appeal but also prevents fingerprints and smudges. Performance Equipped with USB 3.0 technology, the SmartQ C307 offers fast data transfer speeds, making it ideal for quickly transferring large files like photos, videos, and documents. The device is backward compatible with USB 2.0, ensuring it can be used with older computers and devices without any issues. Compatibility This portable card reader is compatible with a wide range of memory card formats, including SD, microSD, SDHC, SDXC, and more. This versatility makes it a convenient tool for photographers, videographers, and anyone who frequently works with different types of memory cards. Ease of Use The SmartQ C307 is a plug-and-play device, meaning no additional software or drivers are needed. Simply connect it to your computer’s USB port, insert your memory card, and you’re ready to go. The LED indicator light provides a clear indication of the device’s status, ensuring you know when your files are being transferred. Value for Money Considering its robust performance, wide compatibility, and ease of use, the SmartQ C307 USB 3.0 Portable offers excellent value for money. Its affordable price point makes it accessible for a broad range of users, from professionals to casual users. Conclusion In summary, the SmartQ C307 USB 3.0 Portable is a reliable and efficient card reader that delivers on all fronts. Its fast data transfer speeds, wide compatibility, and user-friendly design make it an excellent choice for anyone in need of a portable and versatile card reader. Whether you’re a professional needing to quickly transfer large media files or a casual user looking for a convenient way to access your memory cards, the SmartQ C307 is a solid investment.

Works good, still using 1 year later.

The SmartQ C307 USB 3.0 Portable Card Reader is a fantastic little device! It’s incredibly compact and lightweight, making it easy to carry around in my bag or pocket. Despite its small size, it handles multiple card types, including SD, SDHC, SDXC, MicroSD, and more, making it versatile for any kind of media storage. The USB 3.0 connection ensures fast transfer speeds, even with large files, and I’ve noticed a huge improvement in how quickly I can move data compared to older USB 2.0 readers. The all-in-one design is convenient, as it allows me to switch between cards without constantly plugging and unplugging different devices. It’s plug-and-play, so no drivers or software are needed, and it works seamlessly with my laptop. Overall, it’s a reliable, fast, and affordable card reader that’s perfect for anyone who frequently works with different memory cards.

Does what it says on the tin. It works perfectly and it’s kinda fun to fidget with.

Works great, as advertised

La entrega fué muy rápida. Funciona perfectamente como lector de tarjetas sd, lo conecto al PC mediante USB y lo utilizo para pasar fotos, videos y juegos de la Nintendo. Estoy muy contento con la compra, calidad precio insuperable. Aconsejo comprarlo

Very useful. Does its job very well. I love the sliding cover!!(It makes for a fun fidget toy as well)

This device work just as was said. I was able to get my photos off my camera and see them.

Tout marche parfaitement bien, rien à installer en terme de logiciel, rapidité de transfert, et surtout peu couteux ! Je recommande...