Bluetooth Transmitter, APTX Low Latency Optical Socket Wireless Double Bluetooth Adaptor,Pair 2 at Once Support Two Headphone One TimeDual Transmitter: One portable adapter to use as Dual Transmitter(pair to headphones or speakers at once), Aptx Low Lantancy HiFi Sound QualityLow 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. UK Import CSR Bluetooth Chip Latest and Best Bluetooth 4.1 Chip. Compatible Most Bluetooth Device Automatic Re-pairingConstant Streaming and automatically re-pair with existing paired devices. Ultra Long Time Battery and Multi Connection Internal battery provides up to 15 hours of using, Support Audio and Optical Connection and 3.5mm Cable: You get maximum flexibility with support for 3.5mm (AUX and RCA),and Optical output.Cable-Free Roaming: keep your old stereo or wired headphone alive with new Bluetooth wireless connection, pair with smart phone or tablet from up to 30 feet away, and enjoy great music cable-free.