The voltage of +C, +RX and +VT pins are selected on the back of the board.

Please apply solder to the middle and either right or left pads accordically which voltage you need.

+C (Camera) and +VT (Video trasmitter) pins can be powered from 5V or 9V depending on your hardware needs.

+RX (Receiver) pin is designed to work from 5V (Battery) or 4V5 (USB port). 4V5 allows you to power and configure receiver without plugging in the battery. Please be aware that in 4V5 mode with connected receiver it can be problematic to initiate DFU mode. If you are not planning to use DFU often, we highly recomment to use +RX in 4V5 mode.