Mouser Electronics AIO-CM4-101, User Manual

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There are 3 buttons on the backside of the case that work as
Audio output , Volume-, and boot mode selection, as
Figure 7 shows. The product CS12800RA4101A boots from the
internal eMMC by default. If you want it to boot from the USB
OTG connector, please press the Boot Mode button BEFORE power-
on, and release it 3 seconds after power-on.
Figure 7: Buttons
Dimensions
T h e d i m e n s i o n s o f C S 1 2 8 0 0 R A 4 1 0 1 A - C 1 1 1 a r e
260.54*178.54*26.9mm, as Figure 8~10 show.
The product CS12800RA4101A-C111 can be mounted by using
75*75mm VESA holes.