VOXOA XTV200 Bluetooth Wireless Low Latency TV System 2nd Gen, No Lip Sync/Echo, Good for All HDTV Sets with Digital Audio/Headphones Jack 2nd generation, especially designed for no lip sync and personalized TV viewing enjoyment Extendable one person, one set, a couple, two sets and get everyone a set to enjoy TV together Blue caster has both optical input and output to extend TV audio to another set Multiple point connection, built-in mic on headphones, connect to TV (blue caster) and your smartphone The blue caster doubles as a low latency audio broadcaster/streamer or as a receiver, both the blue caster and the headphones are low latency Connectivity technology : Bluetooth