Most of the data on the market can't be saved after switching off the voltage, but our product has been improved, Settings will be the same as when you turn on or off the voltage. With a voltage meter and voltmeter displays self-calibration. Uses a more advanced microprocessor voltage voltmeter error ± 0.05V, Range 0 ~ 40V. (To ensure accuracy voltmeter, make sure the input voltage of 4.5V and above) Touch of a button to switch the input or output voltage measurements and has a light show which is being measured voltages, and save the settings, even the power off and then on Input Voltage 4.5~ 40V. (Input voltage must be higher than the output voltage of 1.5v or more) Adjustable output voltage range of 1.25V ~ 37V continuously adjustable. (Input voltage must be higher than the output voltage of 1.5V)