This is a photo of the PCB inside of the battery box of the LED macro ring light. It has two AA cells, which can’t put out high enough voltage for the white LEDs, so the circuit on the PC board boosts the voltage. This draws nearly 3/4 of an amp from the two AA cells, so it’s rather power hungry and the batteries don’t last very long. The red and black wires go to the batteries. Fortunately there is a jack for the 3V wall wart AC adapter, but that didn’t come with the ring light, it must be an optional item.