This is 5.5mm x 2.1mm Female DC Power Plug to Spring Terminal Connector Adapter, one power connector DC female to another end terminal for CCTV camera accessories, video balun, DC Power Jack Connector. No welding, Spring Clamp Quick Connection. Product Features: Plug Type: 2.1 x 5.5mm Female Terminal Type: Spring Clamp Material: Plastic, Electric Parts. Don't need welding, puch of type connector. Easy to install and use, plug and work. Quick Connector Terminal to cable with Spring Clamp.