Feelworld FW7DII/O - Manual (Page 8)

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The working time for the monitor will be different. Higher capability (working
time) will be longer.
1.6 Power input way
There are some ways to supply the power of the monitor.
1.6.1. The power supply by the adapter. 12V/1.0A is optional DC voltage
changer, insert DC power input interface directly. It can be choosed qualified
adapter which current with output voltage DC 6～24V, output capacity >10W
by customers
Please note that the polarity of power input is inner POSITIVE, outer
NEGATIVE. Otherwise will damage the product. (see attached image)
Please use the adapter attached in the accessories. If necessary to use other
specifications adapter, please note to provide the qualified adapter which
power supply should be not less than 10W (DC6V-15V)
1.6.2. Another option of power source is using batteries. The product back
case including battery slot is available for three types of batteries. Customers
can choose different battery slots according to their needs.
● Battery install way as below picture