Myron&Davis NV7SFT1 - Manual (Page 12)

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Insert a paper clip in this hole and press the
button inside the hole. The system will be
reset to the factory settings.
Descriptions of Buttons
GPS SD Card Port
NAV
MAIN
When on, press the button once to enter
night mode, and press the button again to
enter black screen mode; press and hold the
button to enter standby state; when it is in
standby state, press it to turn on the system.
Turn the knob to adjust the volume.
USB.
12
Press this button to switch to radio mode
from other modes. While in the radio state
press this button repeatedly to switch
between FM1/FM2/FM3/AM1/AM2.