Features:Brand new and high quality. Type:2 Port, Single Blade. Applicability:To Connect two Telephone Wires, Data Signal Cables, and Other Conductors. Suitable Wire Conductor Diameter: 0.4mm-0.9mm. 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!