NO SENSE TO BUY A MARK WITH USB PORTS THAT ARE USELESS! I bought this because it had USB ports advertised as "USB 2.4A HIGH SPEED CHARGING". It didn't even charge my Samsung smartphone, despite that phone being the only USB device connected. The problem is definitely with the extension cord, I tried several different USB cords and finally connected the 110V USB adapter and it charges the phone perfectly. . Also, both 110V and USB outlets are unplugged. Pulling the cable a little will disconnect it. It's dangerous and uncomfortable.
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