Precise Calibrationthis power supply module display with voltage, USB adjustable buck boost power supply module 3.5-12V to 1-24V Output: plug in USB or micro USB can easily output adjustable voltage from 1V to 24V and the power is 3W Adjustable voltage: adopt multi-turn precision adjustable potentiometer to adjust voltage. Data storage: automatically save the state before the power failure, the output data will not be lost. One key to turn off the output, and store the state before power off, no worry about data loss