Product Name: UY Connector Type: 2 Port, Single Blade Applicability : To Connect two Telephone Wires, Data Signal Cables, and Other Conductors. Suitable Wire Diameter: 0.4mm-0.7mm Material: Plastic Casing, Gel-Filled Inside 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! Gel-filled inside design promises an air-tight environment for conductors. High quality and exquisitely design offer - function to protect the connection against air and moisture. Size (Each One): 7/16inch x 5/16inch x 5/16inch (L*W*H) Package Content: 400 x UY Butt Splice Connector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.