Disappointed to receive a black card, the blister indicates a speed of 30 MB / s and a 7-year warranty, while the blister of a card with the same reference SanDisk Ultra microSDHC USH-1 (but "with suit "), red and gray, purchased earlier, mentions a speed of 48 MB / s and a 10 year warranty! One delivered by Amazon is made in China, the other Made in Taiwan. I have not made comparative tests.