Fangrui Product Details The Lcd Can Display Input/output Voltage, Output Current/output Power/output Capacity/output Time Numerical Control Adjustment, Accurate And Fast, Can Boost Or The Voltage, The Output Voltage Can Be Adjusted 0.5-30v, And The Limit Current Can Be Adjusted 0-4a The Input Terminal Is Protected Against Reverse Connection And Not Be Burned When Reverse Connection Occurs The Output End Is Anti-backflow, And There Is No Need To Add An Additional Anti-backflow Diode When Charging The Battery The Module Can Be Set To Be On/off By Default It Has A Variety Of Software Protection Mechanisms And The Protection Thresholds Are Adjustable. After The Module Operating Parameters Exceed The Protection Threshold, The Output Is Automatically Turned Off. The Output Ripple Is Small And Has -type Filtering; Thicken The Heat Sink. Due To Different Batches, The Apperance, Color And Printing Of The Product May Be Different, Which Does Not Attract Use. Colour:black Material:plastic Package Contents: 1 * Buck Boost Converter Onl