Feelworld FW7D/O - Manual (Page 8)

8
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-24V)
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
Suggestion: Better remove the battery for long-term NO
use this product.
Different specifications of the battery, capability is different. The working time