SanDisk Extreme - Flash memory card (microSDXC to SD adapter included) - 64 GB - A1 / Video Class V30 / UHS-I U3 - microSDXC UHS-I - Walmart.com
A2-class microSD cards offer no better performance for the Raspberry Pi | Jeff Geerling
What determines whether you should use a Sandisk A1 or A2 micro SD card for more storage on Android phones? Is the A1 better if not storing photos/videos? - Quora
What do the abbreviations A1 and A2 mean on SD cards?