IMPORTANT! 1.Compatible with Optical/SPDIF, RCA and AUX audio out port. For TV optical output - pls set audio format to PCM. 2.Ensure that the volume on the TV/related AV device is set to a sufficient level. 3.Place the transmitter far away from WiFi devices, e.g., WiFi smart TV, TV box, router etc. Features: (1) This wireless tv headset adopts advanced 2.4GHz Auto FHSS tech, much better than the IR tech, there is no interruption when people passing by, operation is up to 100 feet in open range; Superior to Bluetooth, there is no any lip-sync delay, brings superb sound reproduction to you. (2) The ergonomic& flexible neckband bring a comfortable wearing. This tv earphone is a great choice for people who may not get used to under-chin headset or big over-ear headphone. (3)The by-pass feature supports to stream audio to wireless headphones and wired TV soundbar at the same time. (4) Spare Battery & Convenient Charging Solution support sustained TV enjoyment. (5) Adjust the sudden changed high volume to protect your hearing via Auto Signal Control (ASC). (6) Customize a comfortable volume level via BALANCE & TONE adjustment. (7) Voice enhancement & Noise cancelling techdynamically reduce TV background sound and make the TV dialog stand out which make sure that you never miss another syllable of dialogue again. (8) Mono/stereo optional, we suggest to select MONO to increase the recognition of dialog for the people hard of hearing. (9) This tv wireless headphones for hearing impaired overcomes the weakness of regular hearing aids which amplify the target audio sources and environmental noises at the same time. (10) Wireless earbuds with AUTO POWER OFF when no signal is received.