Datavideo HS-1600T MKII Instruction Manual page 23

SD Card Slot
Insert an SD card into the SD card slot for video recording.
Note that you should only use Class 10 SD card or above. See the
Appendix, Recommended SD Cards, for a list of SD cards
recommended by Datavideo.
Note: Do not remove SD card while it is being written as doing so
may result in corrupted video files.
23