question: What features allow the cable-ready TVs to display HD content without an external box ?
answer: a QAM tuner built-in and/or a card slot for inserting a CableCARD
turker_answer: A QAM tuner built-in and/or a card slot for inserting a CableCARD allows the cable-ready TVs to display HD content without an external box .
rule-based: A QAM tuner built-in and/or a card slot for inserting a CableCARD allow the cable-ready TVs to display HD content without an external box .