It belongs to UY 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!
Gel-filled inside design promises an air-tight environment for conductors.
Good quality and exquisitely design offer corrosion-resistant function to protect the connection against air and moisture.