Features two USB ports for charging. I connected two USB cables to charge two small battery packs, which I usually charge either through a computer USB port or through a USB adapter on an extension cord. USB cables and batteries no longer work. I've checked all the previous ways I charge batteries and they no longer charge. The connectors worked fine initially, but now I suspect a port has failed. I had this extension for 36 hours when all of this happened. Really bad quality. I lost two batteries. I already set up a refund with AMAZON to get my money back. There are too many similar stories about the quality of these extension cords.
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