Feelworld FW689-HD - Manual (Page 8)

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2.e. Battery install way
Suggestion: Better remove the battery for long-term NO use this product.
Different specifications of the batteries, capability is different. The working
time for the monitor will be different. Higher capability (working time) will be
longer.
Without design charging circuit for the monitor, please remove the
battery to the battery charger for charge.
3. Operation instruction
Access to the corresponding signal and power supply.The machine is in a
standby state (red indicator light). At this time press the "POWER" button, if is
in the working state, then repress "POWER" button, the machine returns to
standby state. In the working state, press the "MODE" button on the monitor,
used in switching between HDMI, VGA, VIDEO signals