This module is a 6 Volt to 12 Volt converter. It allows the implementation of modern 12 Volt equipment, like led indicators, rearlights or speedos in a vintage bike that still have a 6 Volt charger system. The maximum usuable load is 3 Watt or 2 Watt constant load. The module fits in the handlebar or even in most LED rearlights due to it´s small size.