Feature:1. With LCD display, it can display input and output voltage, output current and output power.2. The input terminal has anti-reverse protection to prevent the circuit board from being burned.3. Press the button to control the ON/OFF state of the output terminal, and can set the power-on default to ON or OFF.4. The anti-backflow designed at the output end does not require additional anti-backflow diodes when charging the battery.5. Can be boosted and stepped down, the output voltage is adjustable from 0.5-30V,the limiting current is adjustable from 0-4A.Specification:Condition: 100% Brand NewItem Type: Step Up Down ModuleMaterial: Printed Circuit BoardInput Voltage: 5.5-30V (When the input voltage is 5V, it can also achieve step up and down, but the voltage and current measurement is not accurate; when it is lower than 4.7V, undervoltage protection)Output Voltage: 0.5-30V Putput Current: Can work stably at 3A for a long time, and can up to 4A under enhanced heat dissipationOutput Power: Natural heat dissipation 35W, enhanced heat dissipation 50WVoltage Display Sub-Rate: 0.05VCurrent Display Branch Rate: 0.005AConversion Efficiency: About 88%Soft Start: Support (Very high power load module may fail when starting)Input Reverse Connection Protection: SupportAnti-Backflow at Output: SupportShort Circuit Protection: SupportWorking Frequency: 180KHZ.Package List:1 x Step Up Down Module1 x Heat Sink