It is a pack of rechargeable batteries with a voltage converter. It is one of the few with 12v/9v/5v output combination. The voltage status LED is not useful as it shows full charge most of the time and the pack dies suddenly when it shows half charge.The sockets are not stamped with voltage indication and you need to look at the label on the bottom to figure out which socket is providing which voltage.I am using it mainly to power my gaming chair so that it can be completely wireless.
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