The rectifier / regulator converts the AC voltage generated in the alternator to the required on-board network voltage. If the battery is not properly charged or the light flickers, a defective rectifier / regulator is usually the culprit. The component has the same design and performance to the original and represents an affordable replacement part. Fits all 50cc to 150cc 4-stroke scooters from China with AC electrical system and a controller with 6-pin connector cable. Please compare with the existing rectifier / regulator before ordering.