Used you change from stock/custom LED to other custom LED turn signals, which may run on another wattage/load. The mo.load is used to adjust the load/flashing frequency of LED turn signals, so the ECE will not trigger a fault code. Flashing speed adjustments can be made in 16-steps with the frequency dial. The mo.load has up to 7.5W of adjustment power to cover all fault code issues. The small dimensions offer a quick and easy 'out of sight' installation solution. - For 6V or 12V - Dimensions: 49.5 mm x 14 mm x 12 mm - Weight: 15 gram - Cable length 30cm Note: Not compatible for incandescent to LED turn signal conversions.