Push button switch to turn fuel injector on with LED battery condition indicator light Will flush and back flush injectors for best possible cleaning process Fits most OEM HV2 fuel injectors used on motorcycle engines Kit includes fuel injector cleaner tool, pigtail and 9V battery Durable anodized billet aluminum construction Built tough for everyday shop use Easily clean most fuel injectors Compressed air not required For best results use Motion Pro fuel injector cleaner part # 3704-0389, it's specifically formulated not to harm O-rings and other fuel injector moving parts (sold separately).. FUEL INJECT CLEAN KIT HV2