Intellgient, cheap USA charger. Unplug and it switches itself off

I have a power block that closes itself down when current is not being drawn. But this is the first time I have seen the technology in a USB charger. The video seems to be an over-the-top promotion for a 13 US dollar charge, but still. When you unplug the phone, the power consumption of the charger drops to near zero.

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