The Huawei NM SD128GB is a memory card specially intended for the Huawei Mate 20 (Pro) and the Huawei P30 (Pro). Expand your memory with 128 GB extra storage space, which is sufficient for all your photos, videos, games and mobile apps. Huawei calls this storage card an NM card, or Nano Memory card. The biggest difference with the usual micro SD card is the size. An NM card is about 45% smaller, so your phone has more room for a larger battery, for example.