This SD4.0 card reader is highly recommended. No matter how high-performance the memory card is, if the card reader is low-spec, its performance won't be realized. Many memory cards using USB3.0 are only SD2.0, so those who are not aware often blame the card... At least SD3.0 is required to guarantee 104MB/sec, and depending on the product, it can reach 140-170MB/sec. Don't be deceived by products that emphasize only USB3.0 for less than 5,000 won... You should choose products that are SD3.0 or above, or 104MB/sec or higher, to get over 70MB/sec from Samsung EVO MicroSD. The Ugreen SD4.0 can fully utilize the performance of all cards except for MicroSD (TF) using NVMe. Personally, I would highly recommend the cost-effective Lexar 310, and Ugreen products are also good. There are good products among TF card-only card readers that cost around 8,000 won. See the attached photos.

1. When you buy from this seller, you know the quality and delivery will be as expected. 2. I didn't expect such writing speed from the card reader, over 100 Mbps, it deletes instantly. 3. The product is of high quality, you know what you are paying for. 4. I uploaded fresh photos as confirmation.

Came in at a decent speed, seems to do the trick. I'd love to find out if it can hit 300 Mbps but don't have anything on hand to test it out. Seems more solid than other readers I've owned but other than that got nothing else to say about it.

The SD card reader works perfectly. It reads both SD and microSD cards quickly, and file transfer speeds are stable with no disconnecting issues. Plug-and-play with no setup needed. Very convenient to carry and use.

Delivery was fast and I am quite satisfied with the product. The size is slightly larger than I expected, but it works fine. I ordered two and tested one right away, and it works normally. I attached a photo comparing the size with an AA battery.

I have both 3.0 and 4.0 versions. Both products reach almost the maximum speed, but 4.0 is about 5-10% faster. If you can afford it, I strongly recommend SD 4.0. I measured it with a Samsung 1TB Pro, and of course, using more SD cards that support UHS-2 will yield even faster speeds.