ITEM NAME:LM2577 Solar DC-DC Auto Boost step Up step down Converter Module JfJ Gw.Good for solar. Auto step down step up(SEPIC). Low ESR Sanyo filter capacitance, plus another LC filter unit. Output: 1.25V-30V. Input: 3-35V. Output ripple 40mV. Color:Blue(as the picture shows). Conversion efficiency 92%.