DIRECTV HR21PRO Professional Video Recorder Storage - Hard Drive Capacity - 500 GB; Audio - Sound System - Dolby Digital; Video - Video Formats - MPEG-4; Network & Communication - Ethernet; Network & Communication - Ethernet Technology - Ethernet; Interfaces/Ports - HDMI; Interfaces/Ports - Composit Interfaces/Ports - Component Video; Interfaces/Ports - Network (RJ-45); Interfaces/Ports - USB; Interfaces/Ports - Number of Digital Optical Outputs - 2; Height - 3.5 inches; Width - 16.9 inches Depth - 12.3 inches; Weight (Approximate) - 9.50 lb