Clarity Clarity Professional Extra Headset Receiver for the C120 Wireless TV Amplifier Clarity Power technology makes TV programs louder and clearer, amplifying incoming sound 50dB at 124dBSPL up to 38' Compatible with TVs, stereos, MP3 players and public IR systems Home setting provides Hi-Fi stereo sound from TVs, stereos and MP3 players with supplied transmitter Away setting receives 95kHz transmissions from public IR broadcast systems, such as movie theaters and museums Telephone call notification through the headset when connected to a landline phone