monitoring platform.
1. MIC
2. Keyhole: used to remove the recorder
from the bracket
3. Scroll down to select functions or data
column items
4. Menu: switch between the default dis-
play interface and the menu interface,
and return the subdirectory to the root
directory
5. Flip up and select to complete the selec-
tion of function or data column items
6. Confirmation: to confirm the function or
data column item, press the button for 3s
continuously in the default display inter-
face to trigger the printing function
7. Speaker hole for internal sound output
8. Dot matrix LCD screen
9. Compartment door cover, which con-
tains 3C label, USB screen printing, DB9
screen printing, and USB interface and
DB9 interface inside
10.IC card slot