For retro fans who are in the UK, it would be wise to take account that if you pick up an NES Classic Edition system it won’t come bundled with an AC adapter. While this may seem like a facepalm-worthy decision from Nintendo, fear not. The console is powered via USB, therefore you can use any USB AC adapter (the same thing you use to charge your phone/tablet).
It’s hard to say exactly why this call was made, but considering the fact that most people have multiple USB-AC adapters floating around their house, it shouldn’t end up being any big deal. And if you somehow don’t have one, it only costs a few bucks to pick one up.