SanDisk Ultra microSDXC UHS-I Card with Adapter SanDisk Ultra microSDXC and microSDHC cards are fast for better pictures, app performance, and Full HD video.(1) Ideal for Android smartphones and tablets, these A1-rated cards load apps faster for a better smartphone experience. SanDisk products are constructed to the highest standards and rigorously tested. You can be confident in the outstanding quality, performance and reliability of every SanDisk product.