Each MicroSD card will have its actual minimum sequential write speed indicated by a letter and number on the card. The number indicates the speed in MB/s, with the letter representing the generation. A C10, U1, and V10 are all essentially the same speed, just written differently, so you're likely to see multiple symbols printed on each card. I'd recommend checking out the SD Association's page on speeds with a handy chart showing the full comparison.
const curTime = posToTime.get(pos);
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"I'm overwhelmed and so happy," she added. "I wasn't expecting this, but it does really mean a lot to me from my peers."
newscientist.com