ITEM NAME:DC-DC Boost Converter 3.3v 5v 9v 12v 2A Adjustable Step Up Power Supply ModuleSE Features: Oscillation frequency 1.2MHz efficiency is as high as 95% Circuit has short circuit protection, overheating protection function 10k to adjust potentiometer, adjust the output voltage Parameters: Maximum input voltage: DC 2-24V Maximum output voltage: DC 2-28V Switching frequency: 1.2MHz Maximum current output: 2A Packing: 1Pcs Note : any questions, turn the potentiometer in one direction more than 10 rotations for try.Maximum current output: 2A. Circuit has short circuit protection, overheating protection function. efficiency is as high as 95%.