Recommended Uses: TV / DVD with optical, RCA or AUX audio output AV receiver & other audio devices For no audio delay, long music play time (10H) and long range Doesn't work / not recommended for: When using the transmitter the TV internal speakers might not work or become muted. This is TV dependent Dolby / DTS is not supported. When using TV optical out, MUST set audio format to PCM Not for TVs with non-functional audio output ports (test before purchase) Not compatible with ANY RCA outputs on the back of AV Receivers / amplifiers. Not for professional audiophiles . Attention - Designed & built for a balanced sound with an emphasis on clarity. NOT recommended for heavy bass enthusiasts.