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They are made by Lexar
Lexar has introduced a 512GB NM memory card that retails for $50 in China.
According to official data, this memory card is suitable for various devices, including most new Huawei and Honor smartphones and tablets.
This memory card can achieve 90MB/s read speed and 85MB/s write speed, support smooth 4K video shooting at 60fps. Moreover, it is covered by a three-year warranty.
Nano Memory (NM) — This is a proprietary memory card format developed by Huawei in 2018. The size is the same as nano SIM cards. NM cards use the eMMC 4.5 protocol. Up to this point, versions with 64 GB, 128 GB and 256 GB were released.
