It doesn't work
I bought one for my family in Vietnam and use in Viet Nam. In Vietnam, Electricity voltage is 220V. I used this for a rice cooker, it made my rice cooker broken. I continue using it for a Dehumidifiers, then it was broken too. Finally, this product made two my electric devices broken.
I checked the voltage of this transformer electronic, its is 110V.
I dont know why.