TVGuardian LT simply mutes phrases with foul language; it does not display closed captions like previous models. Works with any HDTV, Standard TV and/or Audio Receiver. Learns standard IR remote control codes to mute both a TV and an Audio Receiver. The TVGuardian monitors the hidden closed-captioning signal and compares those words to its database of offensive words and phrases. When an offensive word is detected it mutes the sound for the sentence. Input Connections: Two Yellow (Composite Video) port. This connection is REQUIRED for the TVGuardian to detect the closed-captioning and filter the language. Your Tuner, DVD Player, Satellite Receiver or other source must have and use the Composite Video output. Online streaming like Netflix or Hulu is NOT supported. Output Connections: Dual IR Cable. This cable will connect to your TV and home theater receiver. When the TVGuardian detects profanity it will simulate pressing the Mute button and will prevent the offensive phrase from being heard. The TVGuardian automatically detects and filters profanity and other offensive phrases while you watch movies or television shows. Watch Movies Profanity Free Watch TV Profanity Free Control The Content Allowed In Your Home The TVGuardian monitors the hidden closed-captioning signal and compares those words to its database of offensive words and phrases. When an offensive word is detected it mutes the sound for the sentence. The Details: The TVGuardian technology is a very unique and revolutionary product that uses the closed-captioning to detect and mute profanity. This technology has some limitations. The TVGuardian's input is a tuner. The most common tuners are Cable Boxes and Satellite Receivers. The DVD movie or TV show must have concurrent closed-captioning. DVDs distributed by Universal Studios and some movies distributed by Fox will not work with the TVGuardian because they do not use closed captioning with their DVD's. VHS videos from Universal Studios and Fox WILL work with the TVGuardian. The TV Guardian detects profanity by reading the closed-captioning signal. Occasionally, because of errors in the closed-captioning signal, bad words may slip through. The TVGuardian will not work with streaming internet content from services like Netflix or Hulu.