Electricity was considered a luxury in his time, but it appeared that all these coffee makers utilized it as a power source now that she had pointed it out. To be fair though, Aberforth had noticed outlets in his own home and had felt rather uncomfortable at first to be living in such a high quality place without being expected to pay for it. It didn't feel right. He waved off her comment about being offensive, pausing for a moment to look a bit more closely at the boxes before answering her. "It's a luxury. Some of the bigger cities have it, but even then some places are still rebuilding. I have used electricity to plug something in before though, yes." he said with a nod, "I prefer the muggle world." he added as an afterthought. It was the bit of information about himself he readily volunteered to almost anyone, though in his own time it was well known.
At her assumption, he nodded wondering what other sorts of coffee there were aside from plain but deciding not to ask. The coffee makers themselves were already giving him a bit of a headache. "Just coffee." he agreed.