1、LCD digital display, can display input and output voltage, output current and output power. 2、Input end anti-reverse connection protection, reverse connection will not burn out. 3、It can used for voltage boost and buck, the output voltage can adjusted arbitrarily from 0.5 to 30V, and the current can adjusted arbitrarily from 0 to 4A. 4、The voltage boost and buck chip is used as the main controller, external 60V 75A MOS tube is used as the switch tube, double 60V 5A SS56 schottky is used as the rectifier, with sufficient voltage resistance and sufficient power. 5、Output ripple small, with LC filter. 1 x Step Up Down Module1 x Cooling Fin  Condition: 100% Brand NewItem Type: Step Up Down ModuleMaterial: for PCBColor: As Pictures ShownInput Voltage: 5.5-30VOutput Voltage: 0.5-30V Output Current: Can work steadily in 3A for a long time and reach 4A under enhanced heat dissipationOutput Power: Natural heat dissipation 35W, strengthen heat dissipation 50WVoltage Display Resolution: 0.05VCurrent Display Resolution: 0.005ATransfer Efficiency: Approx. 88%Input Reverse Connection Protection: YesAnti Reverse Irrigation at Output End: YesShort Circuit Protection: YesWorking Frequency: 180KHZSize: Approx.  66.2x 48.1mm/ 2.61x 1.89inch