NO AUDIO LAG FOR WATCHING TV. With latest CSR 64215 Bluetooth V4.2 chipset, TROND TD-BH01 is one of the few TV wireless headphones which truly support the codec of "aptX Low Latency" and greatly reduce the audio latency to approx. 30~40ms. You can now watch TV shows or videos without any noticeable audio lag. You will need one ADDITIONAL Bluetooth transmitter, such as TROND BT-DUO series, in order to connect to your TV and to completely avoid any lip-sync issues CODEC LED INDICATORS. For most Bluetooth transmitters or wireless headphones, customers usually don't know which codec is active after pairing. Even worse, some brands falsely advertise the concept of "low latency", whereas their devices don't support aptX Low Latency. TROND TD-BH01 reveals the truth to you, by displaying different indicators for different codec SUPERIOR SOUND & EXTRA BASS. Equipped with 40mm dynamic drivers and aptX technology, these Bluetooth V4.2 headphones can deliver the well-balanced surround sound with prominent bass and clear treble, by pairing with your smartphones, tablets, or PCs. Integrated bass boost feature caters to those who are into hip hop or electric, but could be too much for those who prefer classic music genres