@marunmagesh would know more about electric toothbrush, spotted him playing with that once!
I wanted an electric toothbrush that can be charged via USB (for travel).
Now I have a toothbrush that can charge other devices via USB.
Wait, what? 
Why would anyone want that!?
(Luckily it comes with a 100-240V AC wall wart, which also works for travel.)
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my soocas brush doesn't let it charge using USB. it has a standard 220v wireless charging station that charges the brush. maybe you can mod it to work for usb input.
End of conversation
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