LED Display LM317 Adjustable Voltage Regulator Step-down Module AC\/DC To 3V 5VFeature:Model: LM317Input: DC 0-30 V、 AC 0-20 VOutput: DC 1.25-28VOutput current: 2A(Max)Size (L*W): 68 x 50 mmThe minimum differential input and output: 3VPackage includes:1 x LM317 Voltage Regulator Module