The A1 symbol on Micro-SD cards tell you if it is fast enough for apps - NotebookCheck.net News
A1 vs A2 SanDisk MicroSD Card: What's The Difference? - MyMemory Blog
SanDisk Ultra 64GB 100MB/s Class 10 Micro SD SDXC UHS-I A1 Original - Skmmart
A1 VS A2 SD Card: Compare Them and Make a Wise Choice
A1 vs A2 SanDisk MicroSD Card: What's The Difference? - MyMemory Blog
New Sandisk Micro Sd Memory Card A1 A2 Microsdhc Microsdxc Card C10 U3 4k Hd Trans Flash Cards For Game Dji Camera Phone Tf Card - Memory Cards - AliExpress