PARAMETER --- Input voltage range DC 6V-32V; Output voltage DC 1.5V-32V; Max output current 5A, recommend use of within 4.5A; Max output power 75W, recommend use of within 50W.GENERAL USE --- As ordinary step-down module with over-current protection; As constant current LED driver module; DIY a solar power controller, etc.NOTE --- 1). Output voltage is set as around 20V by default, if your input is lower than that, please turn potentiometer anticlockwise for 10 laps or more until voltage changes. 2). The case is packaged unassembled to avoid damage during transit. It needs to be manually installed. 3). Please carefully read the users manual, especially the Cautions before using. You can find the PDF Instructions on this page -- Product information -- Product guides and documents -- User Manual PDF: .DISPLAY --- Large clear digital LCD display voltage & current value simultaneously.FEATURES --- Constant current/voltage mode; Voltage calibration & current calibration; USB interface; Protective case; Short-circuit protection; Over-temperature protection; Input reverse connection protection.