Dear user, we are sorry for your inconvenience. If the video saved in the Micro SD card is stuck and unclear, it is because the writing speed of the memory card does not meet the standard, so only low-quality video can be saved. We recommend that you use a Micro SD card dedicated for cameras (the writing speed is greater than 20 MB/s). This Micro SD card has a higher writing speed, and the saved video will not be stuck or unclear. In addition, 8 GB to 128 GB cards are supported based on the camera model.