What do the abbreviations A1 and A2 mean on SD cards?
SanDisk Ultra A1 — BlackboxMyCar
32G micro SD card U3/V30/A1 with adapter 4 packs memory card suitable for home surveillance camera hunting camera and driving recorder memory card K&F CONCEPT - KENTFAITH
Patriot EP Series - MICRO SDXC V30 A1 Flash Card
Canvas Select Plus microSD Card, A1, Class 10 UHS-I, 16GB to 512GB - Kingston Technology
The A1 symbol on Micro-SD cards tell you if it is fast enough for apps - NotebookCheck.net News
32G micro SD card U3/V30/A1 with adapter 2 packs memory card suitable for home surveillance camera hunting camera and driving recorder memory card K&F CONCEPT - KENTFAITH
64GB Sandisk Ultra SD/MicroSD Memory Card Class 10 A1 – Adapter Included - OSA Electronics
Silicon Power 64GB-1TB Superior UHS-1(U3) V30 A1 Gaming MicroSD Memory – SP Silicon Power
A1 vs A2 SanDisk MicroSD Card: What's The Difference? - MyMemory Blog
Lexar 64GB Micro SD Card 2 Pack, microSDXC UHS-I Flash Memory Card with Adapter - Up to 100MB/s, U3, Class10, V30, A1, High Speed TF Card (2 microSD Cards + 1 Adapter)