Im sorry if my post is not in the right section.
Pls i need help. I purchased a sterilizing unit and electric breast pump frm US, they both use 110volts. The sterilizing unit is 650watts, while the other is 18watts. How do i use it safely without risk of being destroyed by nigerias 220volts. I was told to buy a step down, on getting to the store, i was told it was the wattage dat was important. Im really confused.

The wattage of the step down transformer should be significantly higher than the wattage of the load. Buy a 1000watt step down transformer