Datavideo SHOWCAST 100 4K Switcher with Built-In Streaming Encoder - Manual (Page 21)

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BITRATE
Use the BITRATE button to switch between high
(H), medium (M) and low (L) bitrates for RECORD
and STREAM functions. See
Section 6.4 for details.
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.