The HR21 Pro HD DVR delivers the ultimate home theater experience. With up to 100 national channels of HD available by the end of the year on DIRECTV the HR21 Pro Series is your HD solution. It can record up to 100 hours of HD programming, twice the capability of the HR21.General Information - Manufacturer - DIRECTV; Manufacturer Part Number - HR21PRO; Manufacturer Website Address - directv; Brand Name - DIRECTV; Product Series - PRO; Product Model - HR21; Product Name - HR21 Digital Video Recorder; Product Type - Digital Video Recorder; Miscellaneous - Package Contents - HR21 Digital Video Recorder HDMI Cable Component Cable S-Video Cable A/V (RCA) Cable Access Card Phone Cord Power Cord 2 x B-Band Converters Remote Control 2 x AA Batteries; 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 - Composite Video; 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