Review on 🔌 UGREEN USB C SD Card Reader - Micro SD Adapter USB 3.1 OTG Memory Card Reader for MacBook Pro Air M1 iPad Pro Samsung Note 20 S20 - TF SD Micro SD SDXC SDHC MMC RS-MMC Micro SDXC Compatible by Juan Mcallen

This is advertised as a USB 3.1 device on the Revain site. But when I plug it into my Motorola phone's USB-C port, it shows up as a USB 3.0 device connected. Also, on the specs page in the little folded paper "manual" that came with it says "Input: USB-C 3.0 M" so here it is. (In fact, it says so on the back of the box too.) That said, I've plugged it into both my phone and Chromebook (both with USB-C ports) and the device seems to work. Loading is slow with an old microSD card (4). But with the newer U3, the V30 microSD seems to be much faster. So I'm wondering if the people reporting it's very slow are using old microSD or SD cards? I didn't do any speed tests. Hence 3 stars due to the inconsistency between the characteristics of the website and the product. If the manufacturer can provide a good explanation for this, I might add a beginning or two.