---
product_id: 146116669
title: "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)"
brand: "smartq"
price: "72 zł"
currency: PLN
in_stock: true
reviews_count: 13
category: "Smart Q"
url: https://www.desertcart.pl/products/146116669-c307-duo-sd-card-reader-portable-usb-3-0-flash
store_origin: PL
region: Poland
---

# USB 3.0 high-speed transfer Cross-platform compatibility Dual SD + MicroSD simultaneous read 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)

**Brand:** smartq
**Price:** 72 zł
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your data game with the SmartQ C307 DUO — speed, style, and seamless sync!

## Quick Answers

- **What is this?** 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) by smartq
- **How much does it cost?** 72 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/146116669-c307-duo-sd-card-reader-portable-usb-3-0-flash)

## Best For

- smartq enthusiasts

## Why This Product

- Trusted smartq brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual-Slot Powerhouse:** Read SD and MicroSD cards at once—no swapping, no adapters.
- • **Lightning-Fast USB 3.0:** Transfer your 4K videos and RAW images at blazing speeds up to 480 Mbps.
- • **Plug & Play Simplicity:** Zero setup hassle—just plug in and start managing your files instantly.
- • **Universal Compatibility:** Seamlessly works with Mac, Windows, Linux, Chrome OS, and even Nintendo Switch.
- • **Pocket-Sized Portability:** Compact design fits effortlessly in your bag for on-the-go data access.

## Overview

The SmartQ C307 DUO is a compact, dual-slot USB 3.0 card reader that simultaneously supports SD and MicroSD cards, delivering fast data transfers up to 480 Mbps. Compatible across major operating systems including Windows, macOS, Linux, and Chrome OS, it offers plug-and-play convenience for professionals managing high-resolution media on the go.

## Description

Never worry about the hassle of file sharing again because you can simply plug C307 Duo directly into the USB port on any desktop or tablet. The combination of the fast speed delivered by USB 3.0 and compatibility with SD, SDHC SDXC, MicroSD, MicroSDHC, MicroSDXC cards makes this small device the perfect companion when you need to manage high definition videos or high-resolution images.

Review: Great quality item for my data transfers - 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.
Review: Modern laptops lack SD card readers - 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.

## Features

- Two-in-One Card Reader: This card reader can simultaneously read SD and Micro SD cards without the need to switch card slots or use adapters. Users can easily handle different types of memory cards, providing greater flexibility.
- High-Speed Data Transfer: Equipped with a USB 3.0 interface, it offers high-speed data transfer, speeding up file transfers and backups. Users can quickly access and manage data on their memory cards.
- Plug and Play: This card reader supports plug-and-play functionality, requiring no additional driver installations. Simply plug it into the USB port of your computer or device, and you can immediately start reading and writing data.
- Portability: Due to its compact design, it's highly portable. Users can easily slip it into a pocket or bag, allowing them to manage data on their memory cards on the go.
- Wide Compatibility: This card reader is typically compatible with various operating systems, including Windows, macOS, and Linux. Regardless of the computer or device you use, you can conveniently access the content on your memory cards.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07VB6C3QJ |
| Additional Features | Plug & Play |
| Best Sellers Rank | #76 in Computer Memory Card Readers |
| Brand | SmartQ |
| Compatible Devices | Laptop, Personal Computer, Tablet |
| Connectivity Technology | USB Type A |
| Customer Reviews | 4.6 out of 5 stars 18,726 Reviews |
| Data Transfer Rate | 480 Megabits Per Second |
| Hardware Interface | USB 3.0 |
| Item Dimensions L x W x H | 2.77"L x 0.75"W x 0.51"H |
| Manufacturer | SmartQ Inc. |
| Media Type | MMC, SD Card, SDHC, SDXC, UHS-1, microSD, microSDHC, microSDXC |
| Mfr Part Number | C307 DUO |
| Model Name | C307 Duo |
| Model Number | C307 DUO |
| Operating System | Chrome OS, Linux, Mac OS, Windows |
| Slot Count | 2 |
| Special Feature | Plug & Play |
| Warranty Description | 1 year |

## Product Details

- **Brand:** SmartQ
- **Compatible Devices:** Laptop, Personal Computer, Tablet
- **Connectivity Technology:** USB Type A
- **Media Type:** MMC, SD Card, SDHC, SDXC, UHS-1, microSD, microSDHC, microSDXC
- **Special Feature:** Plug & Play

## Images

![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) - Image 1](https://m.media-amazon.com/images/I/51c7GD5sEIL.jpg)
![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) - Image 2](https://m.media-amazon.com/images/I/61NqfzmLymL.jpg)
![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) - Image 3](https://m.media-amazon.com/images/I/711exDCberL.jpg)
![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) - Image 4](https://m.media-amazon.com/images/I/61fhZvJYslL.jpg)
![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) - Image 5](https://m.media-amazon.com/images/I/614sWrx4PSL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great quality item for my data transfers
*by M***4 on March 18, 2026*

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.

### ⭐⭐⭐⭐⭐ Modern laptops lack SD card readers
*by H***D on April 29, 2026*

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.

### ⭐⭐⭐⭐⭐ A High‑Efficiency, USB 3.0‑Optimized Reader With Reliable Throughput and Broad Card Compatibility
*by A***O on January 15, 2026*

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.

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*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-05-27*