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These microSD cards work as advertised; Class 10 speed, all of them work perfectly, and so far they've lasted a month of continuous recording in 1080P cams around the house. Very happy with the price and quality.
This product looked like the perfect purchase to put in my Roku devices so i can store more channels without Roku having to reload them. I tried the Amplim SD card in 3 of my Rokus (i have 6) and Roku could not format them. I haven't tried them in any other devices like cell phones but just thought i should pass along my experience.