LOW DELAY: aptX Low Latency for High-fidelity Stereo Sound, lag-free content streaming in transmitter mode. Low Latency supported Bluetooth receiver is required. Note: not suitable for music instruments due to delay MAKE IT TWO: Upgraded 2-in-1 Bluetooth V4.1 transmitter can be paired with two Bluetooth receivers (like headphones + speakers) simultaneously. Note: aptX Low Latency does NOT support Dual Link mode; not aptX when TT-BA07 is set under RX mode. ALWAYS ON: TaoTronics Bluetooth 4.1 2-in-1 Adapter continuously streams even while charging. Built-in battery for up to 10 hours use - enjoy your favorite wireless content all the time. BLUETOOTH EVERYWHERE: In Transmitter mode (TX), turn a non-Bluetooth TV, PC, CD player, iPod, MP3 / MP4 into a Bluetooth transmitter while pairing with Bluetooth stereo. Receiver mode (RX): Ideal for home or vehicle music streaming sound system. Note: You could not use it for calling since there is not built-in mic. PURE SOUND: aptX audio codec for a richer and deeper sound experience. Listen to CD-like audio quality at no compromise. Plus, 12 + 6 month extended warranty and 24/7 friendly customer service.