What country are you in? In the U.S., wall voltage is 117 VAC (rms), at 60 Hz. In Europe and Japan, it's 220 VAC at 50 Hz.
USB output is 5 VDC, with a maximum current of a few hundred mA.
If you don't know what you're trying to power, choosing the wrong option will do a lot of damage.
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> choosing the wrong option will do a lot of damage.
. bzzzzZZT POW! Been there, done that, hope to avoid it in the future.