The microSD card produced by regular manufacturers should be used for Xiaomi Smart Camera C500 Pro, preferably a dedicated card for security surveillance.
The maximum supported capacity of microSD card is 256GB (256GB, excFAT format microSD card needs to be formatted into FAT32 format in Settings -Storage Settings by going to the Camera Plug-in page in Mi Home APP), and it is recommended that the read/ write speed of the card is not lower than class U1/Class 10.