The TiVo Premiere Series 4 TCD746320 is a DVR unit designed for recording and storing media in MPEG-4 format. With a maximum resolution of 1080p (HD), this black unit offers various connectivity options including Digital Audio Optical TOSLINK, Coax, USB, Composite Video RCA, Ethernet, HDMI, E-SATA, and Antenna. The TiVo features make it easy to manage and access your recordings, while the built-in DVR/Hard Drive Recorder allows you to record and store your favorite shows and movies. With 1 unit in the package, this TiVo Premiere Series 4 is a great addition to any home entertainment setup.