This is a class 10 microSD card, and it works just as advertised. It's very fast- good for recording HD video and such. It's pretty decently priced per gig for a card of its class.However, beware that adapter that comes with it! Put the card in, good luck getting it back out. I made the mistake of doing this to test the memory on my laptop, and actually had to resort to pliers to pull them out, which is probably not a great way to keep the chip in tip-top shape. Note I also said 'them' there- I got two of these and they were both that way, so I doubt it was just a manufacturing defect.Buy the memory, throw away the adapters. Seriously, they are dangerous to use and for all intents and purposes convert it into a standard SD card permanently.Pro:ReliableFastGood priceCon:Adapter: It's a trap!