I bought this knowing it wouldn't ground anything, but I wanted to put 2 prongs into a switch outlet. I figured it would be safe enough as long as I'm not using any electronics that need to be grounded. The first time I tried to turn it off it wouldn't turn off, flipped the switch, it stayed on, pressed harder, it went off when I held it, the light came on. Feels cheap. I read several reviews that USB chargers don't work at all, I didn't check mine. I throw it away, I don't feel safe to use it.
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