DROK Adjustable Automatic DC-DC Non-isolated Buck-Boost Voltage Converter Regulator 3.8-32V to 1.3-35V 5V/12V/24V 3A 12W Step-up/Step-down Power Supply Transformer Module Board Small size(532513.5mm), includes potentiometer, light weight and easy to install. Input voltage:DC 3.8-32V;Output voltage:DC 1.25-35V (continuously adjustable); Input current:3A (max). This module built-in NMOS transistor, the conversion efficiency is higher than LM2577 triode. Can be adjusted by 3296W precision multi-turnadjustable potentiometer,clockwise turn boost,counterclockwise turn buck. Output power: 12W (natural cooling, input voltage is more than 10V), please do enhance heat dissipation if it works on high current applications.