It belongs to U type wire conductors butt splice, which changed complicated traditional cable wire twist and soldering connection method. Insert two conductors separately into two ports without stripping conductors insulation; Crimp or squeeze the yellow button onto the inside two conductors with a pliers (here is not included.); Now you finished it! -filled inside design promises an air-tight environment for conductors. High quality and exquisitely design offer corrosion-resistant function to protect the connection against air and moisture.