Product label differs from box label. The microSD card is labeled "Extreme" and the blister pack is labeled "Extreme PRO". I've tested on multiple readers, including the included full-size SD card adapter. I compared this to an old 32GB SanDisk Ultra MicroSD that I used. Ultra meets specifications. This Extreme recorded a repeatable write speed of 8.9-9.4 MB/s. The read speed was stable at 16.3-16.6 MB/s. It uses Satechi and Cable Matters USB-C USB Type 3 and 3.1 readers. The default is 90/100 MB/s, write/read. Also, my 2016 MacBook Pro took up to 20 seconds to mount the volume, while every other card I tried mounted almost immediately. Something is obviously wrong with this card. I have requested a refund. This is the only SanDisk SD or MicroSD card (out of 15 cards I have, ranging from 2GB to 128GB).
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