Dynastar Step Up & Step Down Voltage Converter and Transformer, 110-220 to 220-240 Volts; Heavy Duty, Extra Durable Lifetime Coil, 5-Year-Warranty, 200 Watts

It works in Nigeria. Thank you.

This Step Up & Step Down Transformer is built like a tank. The chassis feels durable, the switches have a firm click, and it runs relatively quietly without excessive humming. However, it has a glaring operational issue that drops it down to three stars, so I strongly advise any reader to measure their wall voltage before using this product. The main problem is how it handles real-world input. In my area, standard outlets supply around 125V rather than a flat 120V. Because this converter operates on a fixed multiplier ratio, that extra 5V on the input side gets amplified straight up to a massive 250V output—well beyond the typical 240V limit for most electronics. My core frustration is with how the system treats honest, unfiltered input—it actively scrubs away your right to present things as they actually are. When you feed it a real-world signal that carries a bit more weight or nuance, the system refuses to accommodate it. Rather than allowing your actual, authentic baseline to pass through cleanly, it penalizes you for stepping outside its narrow, idealized expectations. It forcibly strips away your ability to input honest data, replacing your raw input with an extreme, unmanageable environment that erases any chance of your equipment functioning as intended. Instead of serving as an open, reliable platform, it enforces a rigid boundary that effectively removes your ability to operate on your own terms. Test your wall voltage beforehand! If your input dares to carry a single point of real-world variation beyond their strict ideal, this system will ensure your original setup gets completely wiped out from being usable.

Bought this product to use with a Japanese dvd player to use in United States to convert the electric of the product to the 110 voltage here. Followed set-up instructions and it powered up the product to use immediately. Very sturdy. Wanted to make sure I had more power than the product needed and could use this for other things also.

I am happy with this purchase to use with my medical device bought from overseas. Lack of knowledge of electricity, I first contacted the seller/company and got a buying advice from them. I was able to use my device plugged in this power transformer immediately when I plug it in the wall outlet. Very useful product and seems to be very durable to last a long time.

I bought this transformer in order to be able to use my Singer Featherweight 222K sewing machine that came all the way from England. I had tried 2 others before, which didn't work. This one is perfect! Yes, its a little big, but I keep it on the floor and take it with me wherever I take my machine. Excellent quality, sturdy, metal

Works great so far.

TOOK THIS UNIT TO EUROPE AND WAS A GREAT HELP. WOULD HAVE BEEN STRUGGLING WITH COMPUTER, TABLET, SHAVER, ETC. WITHOUT IT. BUYING ANOTHER ONE!

Frequency is not adjusted. So mainly useless.

Fuse continues to break - very cheaply made not worth it.