Easy Operation Powered by USB/Micro USB/solder pads. Adjust the potentiometer to obtain the desired voltage. ^^ Adjustable Voltage Utilize a multi-turn precision adjustable potentiometer for voltage adjustment. ^^ One-Key Design One-key operation to turn off the output and the digital tube (short press to turn off the output, long press to turn off the digital tube). ^^ Data Storage Automatically save the state before power failure, ensuring that the output data is not lost.