Ping TangPing Tang 35322 Gold badges66 silver badges1515 bronze badges 1 1 "Just one" draws more awareness to this particular attribute, though also suggesting that you might (or giving you the choice to) explore other characteristics later. To paraphrase, 1 can make the function "extra Distinctive". We use plural nouns https://vodemcasa.com/one-tv-melhores-p2p-do-mercado