DC-DC USB boost power regulator module 5V to 3.3V 9V 12V 24V desktop power module. USB desktop power supply boost boost voltage 5V turn 1.2--24V, adjustable output. Module highlights: 1. Very convenient to use, plug in USB or micro USB to output adjustable voltage of 1.2V-24V. 2. One-button shutdown output. 3. The digital tube can be turned off. 4. Multi-turn precision adjustable potentiometer adjustment. 5. The state before the power failure storage is powered off.