GQ Electronics EMF-390 - Device Controls and Interface; Multi-function Keys; User Interface Overview

Technical question and support
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The multi-function keys (S1, S2, S3, and S4)
The key’s function will be reassigned dynamically based on the Display
Mode.
User Interface
The Popup Window box will show the
current status/value on a current feature
focused. The current status/value only can
be changed when it is showing in Popup
Window. The current status/value will be
confirmed when the Popup Window timeout
after 3 seconds. (Rectangle box)
Press S1 to select display mode
Press S4 to enter Main Menu
3
 S4: Power ON/OFF,
Confirm, Select, Enter.
 S3: up, or content depended
 S2: down, or content
depended
 S1: mode, cancel, exit