The CM387 USB-C to USB 2.0/SD/TF Memory Card Reader Adapter promises a convenient and speedy solution for transferring data from various memory cards. Having spent several weeks testing this compact device with a variety of files and devices, I’m ready to share my in-depth review. This review will delve into its functionality, performance, and overall usability.

The CM387 is a multi-functional card reader designed for ease of use and portability. It supports simultaneous reading and writing to SD and TF (microSD) cards, eliminating the need for constant swapping. The USB-C connection ensures compatibility with a wide array of modern devices. Its small size makes it perfect for travel or on-the-go usage.

The claimed transfer speeds of up to 5Gbps (with USB 3.0) are impressive, and in my testing, I found these claims to be largely accurate. Transferring large video files (around 10GB) took a fraction of the time compared to using a standard SD card reader. The simultaneous access to both SD and TF cards is a huge time-saver, particularly when working with multiple memory cards. However, as noted, devices with USB 2.0 connections will experience slower transfer speeds (around 480Mbps). This is to be expected, and the manufacturer is clear about this limitation.

I tested the CM387 with several different smartphones (Samsung Galaxy S21, Google Pixel 6), tablets (iPad Pro 11-inch), and laptops. Compatibility across all tested devices was excellent. The device was easily recognised, and I experienced no driver issues.

Pros:

• Fast transfer speeds (with USB 3.0)
• Simultaneous SD/TF card access
• Compact and portable design
• Wide device compatibility
• Easy to use

Cons:

• Speed limited by USB 2.0 devices
• No card ejection mechanism (manual removal needed)

Overall, the CM387 USB-C to USB 2.0/SD/TF Memory Card Reader Adapter is a highly functional and convenient device. The speed and simultaneous card access are significant advantages, making it a great addition for anyone who frequently works with multiple memory cards. While the speed is dependent on the host device’s USB connection, this is clearly stated, and the performance on USB 3.0 devices is excellent. I highly recommend the CM387 for its convenience, speed, and versatility.