Wireless TV headphone for Seniors with voice enhancement, Tone control, Balance adjustment, Mono/Stereo option and personal sound amplifier function. Before purchasing, check audio output of your TV/related audio source first, Digital Optical (Toslink/SPDIF), RCA or 3.5mm AUX audio out port is what we need. When using TV optical audio out, MUST set your TV audio format to PCM. Not for TVs with non-functional audio out ports (test before purchase). When hooking up an external audio device, some TV internal speakers might not work or become muted. This is TV's feature. If you experience any problem when connecting to your TV system. Pls refer to the user instructions or reach to our support team, we are confident to get one good solution for you. These RF products are not available for pacemaker carrier as well as people with severe hearing loss.