Tablo SPVR4-01-NA 4 Tuner DVR for HDTV Antennas Color: Black TV Tuner: Four Tuners System Requirements: an HDTV antenna an iPad running Apple iOS7+ OR an Android tablet with a 7�+ screen running Android 4.1 OR a computer an internet connection a USB hard drive (Max 2TB capacity) this is required both for watching live TV and recording programming If you'd like to watch programming on your big screen TV, you'll also need an AppleTV (which uses AirPlay from an iPad), Roku or a Chromecast dongle. You can also use the web-based app with an HDMI-enabled computer connected to your TV.