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Great adapters for transferring between devices with 8mm and 5.5mm ports such as solar cables, RVs, cars, battery charging devices, etc. One end: 8mm female, the other end: 5.5mm x 2.5mm male. Package including: DC 8mm female to DC 2.5mm x 5.5mm male Adapter x 1 ; 2 years long time warranty, just contact us if you have any issues about the quliaty or other questions, we will take the issue for you via replacement or refund. Different brands of solar panels and power stations have different connectors. If you use a solar panel with a 8mm connector to charge its battery pack/PowerStation with an 5.5mm connector, you will have to pay an extra high price for the cable. You can save a lot of money with this adapter. Easily adapt 5.5mm to 8 mm to plug solar panels into solar generator. Conclusion: This connector will change the size of the connector and allow you to operate your devices, but your battery will only charge if your power adapter is as powerful as your devices needs.