Instead of buying power converters for travelling, I just buy the cords I need in the country I'm visiting. I use this on my DS any time I'm in the UK, and on my North-American DS it works perfectly. Charges quickly, and hasn't seemed to affect my battery in any way my Canadian adapter wouldn't. It has the official Nintendo branding, and it has worked for several months now with biweekly charges, so it's either the real thing, or a fake that works perfectly. Either way, costs way less than a converter and didn't fry my device!
Shipping speedily and was packaged securely. Great product.