OPTICAL / RCA/ AUX AUDIO OUT SUPPORTED FOR MOST TVS, ADVANCED 2.4GHZ FHSS TECH, NO PAIRING OR DELAY - Wireless headphones for TV with superior sound reproduction and its strong signal can go through ceilings or walls. Effective range is up to 164 feet. SINGLE DIGITAL WIRELESS TV HEADPHONES - Voice highlighting & noise reduction reduce TV background sounds and make dialogues stand out. Auto signal control makes the output stable, which avoids the hurt caused by a sudden increase in TV volume. CUSTOMIZE THE TV SOUND FOR BEST FIT - Select TONE to find the optimum sound frequency to hear the target audio clearly. The balance control allows for right/left volume adjustment to hear equally well with both ears. Mono/Stereo optional. SPARE BATTERY, AMBIENT SOUND LISTENER - A spare battery is always in the transmitter base charged & ready for lasting TV watching. A full charge lasts about 14 hours depending on the volume. The ambient sound mode (MIC) enables you to hear what people a