Feelworld FW-1D/S/O - Manual (Page 9)

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1.6.2. This product also can be by 4-Pin XLD interface to use the power
supplied from camera.
1.6.3. Another option of power source is using batteries. The product back
case including battery slot is available for five types of batteries. Customers
can choose different battery slots according to their needs.( NO requirements,
the factory defaults assembly F970 battery plate)
● Battery install way as below picture