Xiaomi IMILAB EC3 CMSXJ25A Manuel D'instructions page 10

Note:
When inserting or removing the micro SD card, please disconnect the camera
from the power supply. Please use a micro SD card from a reputable
manufacturer. The recommended read and write speed of the micro SD card
is at least U1/Class 10.
Restoring factory settings
Press and hold the reset button to restore the factory settings. The content
inside the micro SD card will not be deleted.
MicroSD
Micro SD card slot
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