Features 1Easily adjust output voltage and current by long handle potentiometer no screwdriver needed. 2Equipped with large size aluminum heat sink and outer case. 3Clear LCD display of Input Voltage Output Voltage Output Current Output Power And Temperature. 4All round protection: Input Reverse Polarity Protection Output Anti-Backflow Protection (no anti-backflow diode required when charging battery) Overcurrent Protection Over Power Protection Over Temperature Protection. 5Freely adjust output voltage within 0.5-30V and limiting current within 0-6A. 6Press the button to control the F state of the output end and you can set the default ON/OF state of power-on. Specification Item Type: DC-DC Boost Buck ConverterInput Voltage: 5.5-30V (when the input voltage is 5V the buck-boost can also be realized but the voltage and current measurement is not accurate; below 4.7V under-voltage protection)Output Voltage: 0.5-30VOutput Current: 4AOutput Power: 35WVoltage Display Resolution: 0.01V accuracy error 1%Current Display Resolution: 0.001A accuracy error 1%Conversion Efficiency: about 88%Soft Start: Yes (May fail to start at high power load)Input Reverse Connection Protection: YesOutput Anti-Backflow: Yes can be directly connected to the batteryShort Circuit Protection: Yes can directly short the outputTemperature Protection: 100CPower Protection: 60WOvercurrent Protection: 6AWorking Frequency: 180KHZSize: 72x59x32mm / 2.83x2.32x1.26inMounting Hole: 3mmWeight: Approx 81g Package List 1 x DC-DC Boost Buck Converter1 Pack x Assembly Accessories Note Please note that the new type and old type of this product will be sent randomly and make sure you will not mind before ordering. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.