This extension cable is made of high quality heavy duty 16AWG copper wire which is thick and soft. One end is DC 8mm adapter and the other end is positive and negative terminals. The red female connector is positive polarity and the black is negative. Please confirm the positive and negative poles of your solar panel or solar battery portable generator while using. The included adapter can easily convert the interface DC8mm to DC5.5mm*2.5mm. So it allows you to adapt to more types of devices. Suitable for GZ Yeti solar generator, portable power generator, solar power station, solar power pack, battery pack electric vehicle, UPS batteries, 500 Li battery, storage battery, golf cart and forklift and etc. Package include: 1 Pack solar panel to DC 8mm connector cable. 1PCS DC 5.5mm x 2.5mm adapter. Goupchn - Make something different. At Goupchn, we strive to provide high quality tools and accessories that inspire our consumers to live a more convenient and enriched lifestyle. Our unlimited passion for innovation and solutions drives us to move forward. We have strong belief that only if we have a deep understanding of people’s needs and desires, we can make our products become different, which may make your life different. Solar Connector The universal solar connectors used for solar panels, easy to use. Made with high quality material and can be used for more than 20 years. 16AWG Cable The cable is made of heavy duty 16AWG wire which is thick and soft. Solar-DC8mm The cable Solar to 8mm comes with an adapter converter from 8mm to 5.5x2.5mm. Convenient to use for other devices with 5.5x2.5 or 5.5x2.1 port.