The H21, a predecessor of the 2010 model, the H24, was a DirecTV HD satellite receiver. The device outputs high-definition content in 1080i or 720p, via HDMI or component; S-video and composite outputs are also standard. The software includes a 7-day searchable program guide. An update to the H20, the H21 drops the ATSC tuner which allows reception of over-the-air broadcasts, but adds parental controls, a coax audio output, and an ethernet port, and responds faster to the remote. DirecTV also sold a version with DVR capabilities, the HR21. The more recent models feature updated looks and user interfaces, but add few significant features.
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