I have mixed feelings about these blocks. When I first ordered them only 2 out of 4 worked and one of the charging blocks smelled like burnt plastic when plugged in, which I quickly realized there could be a fire hazard. Of those that worked, they offered fast charging. I changed them and when I received the 2nd pack, 1 charge out of 4 didn't work again. They don't seem to be very durable, but they offer fast charging at the lowest price I can find.
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