Indigo BTRT1 Advanced Bluetooth 4.1 Transmitter and Receiver 2-in-1 Switchable Adapter for TVs and Home Stereos, APTX Low-Latency Dual-Stream, Analog and Optical Digital Inputs/Outputs (Black) Advanced Bluetooth 2-in-1 transmitter and receiver adds high fidelity music streaming capability any home stereo or TV Bluetooth 4.1 Technology with ATPX Low-Latency delivers exceptional wireless performance and maximum operation range. Clever 2-in-1 design changes between transmitter or receiver at the flip of a switch Dual-Stream capability in transmitter mode can send audio to two pairs of headphones at the same time! Use either the 3.5mm stereo jack for high quality analog stereo, or the optical audio jack for perfect digital quality with the included optic fiber cable