ITEM NAME:1*Adjustable LM317 DC-DC Boost Buck step up down Converter Solar Module X7O4 Description&Preview.Module size: 35.6mm 16.8mm. Output Current: 1.5 A (min), 2.2A (typ). Current output: 1.5A. You can follow below process to chontact us. Characteristic frequency: 100 (MHz).