TRANSMITTER + RECIEVER: One portable adapter to use as either transmitter or receiver, powered by the latest Bluetooth 4.1, can pair with two headphones / speakers at once. OPTICAL + 3.5mm: You get maximum flexibility with support for both 3.5mm (AUX and RCA) and optical (TOSLINK) digital, both input and output are supported. LOW DELAY: aptX Low Latency technology eliminate Bluetooth audio delay, so you can watch TV / Movie / Video and listen to high-clarity sound in perfect synchronization. Note: aptX Low Latency ONLY supports TX mode.

BLUETOOTH TRANSMITTER AND RECEIVER: Transmitter function transforms 3.5mm audio-out media devices into a Bluetooth device capable of streaming Bluetooth audio; Receiver lets non-Bluetooth devices like car or home stereos receive high quality audio. INSTANT SOUND: Enjoy a latency lower than 95% of other devices with aptX Low Latency technology; end-to-end lag time is now 40 milliseconds so high-definition video is transmitted without problems in Transmitter mode. A 2 FOR 1 CONNECTION: Two Bluetooth headphones or speakers can pair at once so children can watch in silence and give parents a needed break. Note: aptX Low Latency does NOT support Dual Pair mode.