Feelworld FW7D/O - Manual (Page 9)

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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. This product also can be by 4-Pin XLD interface to use the power
supplied from camera.
Operating instruction（When operating，the monitor should be power on
in the working state）